3956430561 has 4 divisors (see below), whose sum is σ = 5275240752. Its totient is φ = 2637620372.

The previous prime is 3956430557. The next prime is 3956430563. The reversal of 3956430561 is 1650346593.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3956430561 - 2² = 3956430557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3956430563) 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, 659405091 + ... + 659405096.

It is an arithmetic number, because the mean of its divisors is an integer number (1318810188).

Almost surely, 2^3956430561 is an apocalyptic number.

It is an amenable number.

3956430561 is a deficient number, since it is larger than the sum of its proper divisors (1318810191).

3956430561 is a wasteful number, since it uses less digits than its factorization.

3956430561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318810190.

The product of its (nonzero) digits is 291600, while the sum is 42.

The square root of 3956430561 is about 62900.1634417590. The cubic root of 3956430561 is about 1581.6164838782.

It can be divided in two parts, 39564 and 30561, that added together give a triangular number (70125 = T₃₇₄).

The spelling of 3956430561 in words is "three billion, nine hundred fifty-six million, four hundred thirty thousand, five hundred sixty-one".