31427084138 has 4 divisors (see below), whose sum is σ = 47140626210. Its totient is φ = 15713542068.

The previous prime is 31427084131. The next prime is 31427084147. The reversal of 31427084138 is 83148072413.

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

It can be written as a sum of positive squares in only one way, i.e., 24676325569 + 6750758569 = 157087^2 + 82163^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31427084095 and 31427084104.

It is not an unprimeable number, because it can be changed into a prime (31427084131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856771033 + ... + 7856771036.

Almost surely, 2^31427084138 is an apocalyptic number.

31427084138 is a deficient number, since it is larger than the sum of its proper divisors (15713542072).

31427084138 is a wasteful number, since it uses less digits than its factorization.

31427084138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15713542071.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 31427084138 in words is "thirty-one billion, four hundred twenty-seven million, eighty-four thousand, one hundred thirty-eight".