31258172949 has 4 divisors (see below), whose sum is σ = 41677563936. Its totient is φ = 20838781964.

The previous prime is 31258172927. The next prime is 31258172987. The reversal of 31258172949 is 94927185213.

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 31258172949 - 2¹² = 31258168853 is a prime.

It is a super-2 number, since 2×31258172949² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31258172999) 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, 5209695489 + ... + 5209695494.

It is an arithmetic number, because the mean of its divisors is an integer number (10419390984).

Almost surely, 2^31258172949 is an apocalyptic number.

It is an amenable number.

31258172949 is a deficient number, since it is larger than the sum of its proper divisors (10419390987).

31258172949 is a wasteful number, since it uses less digits than its factorization.

31258172949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10419390986.

The product of its digits is 1088640, while the sum is 51.

The spelling of 31258172949 in words is "thirty-one billion, two hundred fifty-eight million, one hundred seventy-two thousand, nine hundred forty-nine".