31661402 has 4 divisors (see below), whose sum is σ = 47492106. Its totient is φ = 15830700.

The previous prime is 31661401. The next prime is 31661419. The reversal of 31661402 is 20416613.

It is a happy number.

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., 17380561 + 14280841 = 4169^2 + 3779^2 .

It is not an unprimeable number, because it can be changed into a prime (31661401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7915349 + ... + 7915352.

Almost surely, 2^31661402 is an apocalyptic number.

31661402 is a deficient number, since it is larger than the sum of its proper divisors (15830704).

31661402 is a wasteful number, since it uses less digits than its factorization.

31661402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830703.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31661402 is about 5626.8465413587. The cubic root of 31661402 is about 316.3564649593.

The spelling of 31661402 in words is "thirty-one million, six hundred sixty-one thousand, four hundred two".