31731278074 has 4 divisors (see below), whose sum is σ = 47596917114. Its totient is φ = 15865639036.

The previous prime is 31731278071. The next prime is 31731278093. The reversal of 31731278074 is 47087213713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47087213713 = 89 ⋅529069817.

It can be written as a sum of positive squares in only one way, i.e., 31331478049 + 399800025 = 177007^2 + 19995^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31731278074.

It is not an unprimeable number, because it can be changed into a prime (31731278071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7932819517 + ... + 7932819520.

Almost surely, 2^31731278074 is an apocalyptic number.

31731278074 is a deficient number, since it is larger than the sum of its proper divisors (15865639040).

31731278074 is a wasteful number, since it uses less digits than its factorization.

31731278074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15865639039.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 31731278074 in words is "thirty-one billion, seven hundred thirty-one million, two hundred seventy-eight thousand, seventy-four".