31627443157 has 4 divisors (see below), whose sum is σ = 32482238956. Its totient is φ = 30772647360.

The previous prime is 31627443143. The next prime is 31627443179. The reversal of 31627443157 is 75134472613.

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 29874011281 + 1753431876 = 172841^2 + 41874^2 .

It is a cyclic number.

It is not a de Polignac number, because 31627443157 - 2²³ = 31619054549 is a prime.

It is a super-2 number, since 2×31627443157² (a number of 22 digits) contains 22 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 (31627443137) 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, 427397844 + ... + 427397917.

It is an arithmetic number, because the mean of its divisors is an integer number (8120559739).

Almost surely, 2^31627443157 is an apocalyptic number.

31627443157 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31627443157 is a deficient number, since it is larger than the sum of its proper divisors (854795799).

31627443157 is an equidigital number, since it uses as much as digits as its factorization.

31627443157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854795798.

The product of its digits is 423360, while the sum is 43.

The spelling of 31627443157 in words is "thirty-one billion, six hundred twenty-seven million, four hundred forty-three thousand, one hundred fifty-seven".