1281711601 has 3 divisors (see below), whose sum is σ = 1281747403. Its totient is φ = 1281675800.

The previous prime is 1281711577. The next prime is 1281711611. The reversal of 1281711601 is 1061171821.

The square root of 1281711601 is 35801.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1061171821 = 31013 ⋅34217.

It can be written as a sum of positive squares in only one way, i.e., 237129201 + 1044582400 = 15399^2 + 32320^2 .

It is not a de Polignac number, because 1281711601 - 2⁵ = 1281711569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1281711601.

It is not an unprimeable number, because it can be changed into a prime (1281711611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17901 + ... + 53701.

Almost surely, 2^1281711601 is an apocalyptic number.

1281711601 is the 35801-st square number.

1281711601 is the 17901-st centered octagonal number.

It is an amenable number.

1281711601 is a deficient number, since it is larger than the sum of its proper divisors (35802).

1281711601 is an frugal number, since it uses more digits than its factorization.

1281711601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71602 (or 35801 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 28.

The cubic root of 1281711601 is about 1086.2507894072.

The spelling of 1281711601 in words is "one billion, two hundred eighty-one million, seven hundred eleven thousand, six hundred one".