31677986 has 4 divisors (see below), whose sum is σ = 47516982. Its totient is φ = 15838992.

The previous prime is 31677983. The next prime is 31678019. The reversal of 31677986 is 68977613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68977613 = 149 ⋅462937.

It can be written as a sum of positive squares in only one way, i.e., 31013761 + 664225 = 5569^2 + 815^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31677986.

It is not an unprimeable number, because it can be changed into a prime (31677983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7919495 + ... + 7919498.

Almost surely, 2^31677986 is an apocalyptic number.

31677986 is a deficient number, since it is larger than the sum of its proper divisors (15838996).

31677986 is a wasteful number, since it uses less digits than its factorization.

31677986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15838995.

The product of its digits is 381024, while the sum is 47.

The square root of 31677986 is about 5628.3199980101. The cubic root of 31677986 is about 316.4116903498.

The spelling of 31677986 in words is "thirty-one million, six hundred seventy-seven thousand, nine hundred eighty-six".