1281228901 has 8 divisors (see below), whose sum is σ = 1286112600. Its totient is φ = 1276354560.

The previous prime is 1281228899. The next prime is 1281228911. The reversal of 1281228901 is 1098221821.

It can be written as a sum of positive squares in 4 ways, for example, as 459030625 + 822198276 = 21425^2 + 28674^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281228901 - 2¹ = 1281228899 is a prime.

It is a super-3 number, since 3×1281228901³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281228911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383205 + ... + 386533.

It is an arithmetic number, because the mean of its divisors is an integer number (160764075).

Almost surely, 2^1281228901 is an apocalyptic number.

It is an amenable number.

1281228901 is a deficient number, since it is larger than the sum of its proper divisors (4883699).

1281228901 is an equidigital number, since it uses as much as digits as its factorization.

1281228901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1281228901 is about 35794.2579333613. The cubic root of 1281228901 is about 1086.1144095093.

The spelling of 1281228901 in words is "one billion, two hundred eighty-one million, two hundred twenty-eight thousand, nine hundred one".