31061986 has 4 divisors (see below), whose sum is σ = 46592982. Its totient is φ = 15530992.

The previous prime is 31061963. The next prime is 31062001. The reversal of 31061986 is 68916013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68916013 = 109 ⋅632257.

It can be written as a sum of positive squares in only one way, i.e., 29322225 + 1739761 = 5415^2 + 1319^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7765495 + ... + 7765498.

Almost surely, 2^31061986 is an apocalyptic number.

31061986 is a deficient number, since it is larger than the sum of its proper divisors (15530996).

31061986 is a wasteful number, since it uses less digits than its factorization.

31061986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15530995.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31061986 is about 5573.3280901092. The cubic root of 31061986 is about 314.3473039273.

Adding to 31061986 its reverse (68916013), we get a palindrome (99977999).

The spelling of 31061986 in words is "thirty-one million, sixty-one thousand, nine hundred eighty-six".