31055159987 has 4 divisors (see below), whose sum is σ = 31178885976. Its totient is φ = 30931434000.

The previous prime is 31055159959. The next prime is 31055159999. The reversal of 31055159987 is 78995155013.

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

It is a cyclic number.

It is not a de Polignac number, because 31055159987 - 2¹⁰ = 31055158963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31055159587) 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, 61862618 + ... + 61863119.

It is an arithmetic number, because the mean of its divisors is an integer number (7794721494).

Almost surely, 2^31055159987 is an apocalyptic number.

31055159987 is a deficient number, since it is larger than the sum of its proper divisors (123725989).

31055159987 is a wasteful number, since it uses less digits than its factorization.

31055159987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123725988.

The product of its (nonzero) digits is 1701000, while the sum is 53.

The spelling of 31055159987 in words is "thirty-one billion, fifty-five million, one hundred fifty-nine thousand, nine hundred eighty-seven".