3133157561 has 4 divisors (see below), whose sum is σ = 3149391732. Its totient is φ = 3116923392.

The previous prime is 3133157549. The next prime is 3133157581. The reversal of 3133157561 is 1657513313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1657513313 = 383 ⋅4327711.

It can be written as a sum of positive squares in 2 ways, for example, as 2158531600 + 974625961 = 46460^2 + 31219^2 .

It is a cyclic number.

It is not a de Polignac number, because 3133157561 - 2¹⁸ = 3132895417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3133157581) 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, 8116796 + ... + 8117181.

It is an arithmetic number, because the mean of its divisors is an integer number (787347933).

Almost surely, 2^3133157561 is an apocalyptic number.

It is an amenable number.

3133157561 is a deficient number, since it is larger than the sum of its proper divisors (16234171).

3133157561 is a wasteful number, since it uses less digits than its factorization.

3133157561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16234170.

The product of its digits is 28350, while the sum is 35.

The square root of 3133157561 is about 55974.6153269498. The cubic root of 3133157561 is about 1463.2799159221.

The spelling of 3133157561 in words is "three billion, one hundred thirty-three million, one hundred fifty-seven thousand, five hundred sixty-one".