31529730138 has 8 divisors (see below), whose sum is σ = 63059460288. Its totient is φ = 10509910044.

The previous prime is 31529730137. The next prime is 31529730151. The reversal of 31529730138 is 83103792513.

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

31529730138 is an admirable number.

It is a super-3 number, since 3×31529730138³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31529730138.

It is not an unprimeable number, because it can be changed into a prime (31529730131) 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, 2627477506 + ... + 2627477517.

It is an arithmetic number, because the mean of its divisors is an integer number (7882432536).

Almost surely, 2^31529730138 is an apocalyptic number.

31529730138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31529730138 is a wasteful number, since it uses less digits than its factorization.

31529730138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254955028.

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 31529730138 in words is "thirty-one billion, five hundred twenty-nine million, seven hundred thirty thousand, one hundred thirty-eight".