31700642 has 4 divisors (see below), whose sum is σ = 47550966. Its totient is φ = 15850320.

The previous prime is 31700639. The next prime is 31700651. The reversal of 31700642 is 24600713.

31700642 is nontrivially palindromic in base 15.

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., 20079361 + 11621281 = 4481^2 + 3409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7925159 + ... + 7925162.

Almost surely, 2^31700642 is an apocalyptic number.

31700642 is a deficient number, since it is larger than the sum of its proper divisors (15850324).

31700642 is a wasteful number, since it uses less digits than its factorization.

31700642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15850323.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 31700642 is about 5630.3323170129. The cubic root of 31700642 is about 316.4871046027.

The spelling of 31700642 in words is "thirty-one million, seven hundred thousand, six hundred forty-two".