31157048917 has 4 divisors (see below), whose sum is σ = 31269529516. Its totient is φ = 31044568320.

The previous prime is 31157048899. The next prime is 31157048921. The reversal of 31157048917 is 71984075113.

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 1907156241 + 29249892676 = 43671^2 + 171026^2 .

It is a cyclic number.

It is not a de Polignac number, because 31157048917 - 2¹⁹ = 31156524629 is a prime.

It is a super-3 number, since 3×31157048917³ (a number of 32 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 (31157048617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56239884 + ... + 56240437.

It is an arithmetic number, because the mean of its divisors is an integer number (7817382379).

Almost surely, 2^31157048917 is an apocalyptic number.

It is an amenable number.

31157048917 is a deficient number, since it is larger than the sum of its proper divisors (112480599).

31157048917 is a wasteful number, since it uses less digits than its factorization.

31157048917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112480598.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 31157048917 in words is "thirty-one billion, one hundred fifty-seven million, forty-eight thousand, nine hundred seventeen".