9931974545 has 4 divisors (see below), whose sum is σ = 11918369460. Its totient is φ = 7945579632.

The previous prime is 9931974539. The next prime is 9931974589. The reversal of 9931974545 is 5454791399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5221074049 + 4710900496 = 72257^2 + 68636^2 .

It is a cyclic number.

It is not a de Polignac number, because 9931974545 - 2⁸ = 9931974289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993197450 + ... + 993197459.

It is an arithmetic number, because the mean of its divisors is an integer number (2979592365).

Almost surely, 2^9931974545 is an apocalyptic number.

It is an amenable number.

9931974545 is a deficient number, since it is larger than the sum of its proper divisors (1986394915).

9931974545 is a wasteful number, since it uses less digits than its factorization.

9931974545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986394914.

The product of its digits is 6123600, while the sum is 56.

The square root of 9931974545 is about 99659.2923163716. The cubic root of 9931974545 is about 2149.5383573473.

The spelling of 9931974545 in words is "nine billion, nine hundred thirty-one million, nine hundred seventy-four thousand, five hundred forty-five".