1281150641 has 4 divisors (see below), whose sum is σ = 1315776372. Its totient is φ = 1246524912.

The previous prime is 1281150631. The next prime is 1281150653. The reversal of 1281150641 is 1460511821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460511821 = 3109 ⋅469769.

It can be written as a sum of positive squares in 2 ways, for example, as 989731600 + 291419041 = 31460^2 + 17071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281150641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1281150631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17312810 + ... + 17312883.

It is an arithmetic number, because the mean of its divisors is an integer number (328944093).

Almost surely, 2^1281150641 is an apocalyptic number.

It is an amenable number.

1281150641 is a deficient number, since it is larger than the sum of its proper divisors (34625731).

1281150641 is an equidigital number, since it uses as much as digits as its factorization.

1281150641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34625730.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1281150641 is about 35793.1647245672. The cubic root of 1281150641 is about 1086.0922950523.

The spelling of 1281150641 in words is "one billion, two hundred eighty-one million, one hundred fifty thousand, six hundred forty-one".