31730290157 has 8 divisors (see below), whose sum is σ = 33202533120. Its totient is φ = 30286090080.

The previous prime is 31730290147. The next prime is 31730290171. The reversal of 31730290157 is 75109203713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31730290157 - 2²⁶ = 31663181293 is a prime.

It is a super-2 number, since 2×31730290157² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31730290157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31730290117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7008407 + ... + 7012932.

It is an arithmetic number, because the mean of its divisors is an integer number (4150316640).

Almost surely, 2^31730290157 is an apocalyptic number.

It is an amenable number.

31730290157 is a deficient number, since it is larger than the sum of its proper divisors (1472242963).

31730290157 is a wasteful number, since it uses less digits than its factorization.

31730290157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14021443.

The product of its (nonzero) digits is 39690, while the sum is 38.

The spelling of 31730290157 in words is "thirty-one billion, seven hundred thirty million, two hundred ninety thousand, one hundred fifty-seven".