31661338 has 4 divisors (see below), whose sum is σ = 47492010. Its totient is φ = 15830668.

The previous prime is 31661309. The next prime is 31661351. The reversal of 31661338 is 83316613.

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., 18722929 + 12938409 = 4327^2 + 3597^2 .

It is an unprimeable number.

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, 7915333 + ... + 7915336.

Almost surely, 2^31661338 is an apocalyptic number.

31661338 is a deficient number, since it is larger than the sum of its proper divisors (15830672).

31661338 is a wasteful number, since it uses less digits than its factorization.

31661338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15830671.

The product of its digits is 7776, while the sum is 31.

The square root of 31661338 is about 5626.8408543338. The cubic root of 31661338 is about 316.3562517994.

The spelling of 31661338 in words is "thirty-one million, six hundred sixty-one thousand, three hundred thirty-eight".