31103906 has 4 divisors (see below), whose sum is σ = 46655862. Its totient is φ = 15551952.

The previous prime is 31103887. The next prime is 31103909. The reversal of 31103906 is 60930113.

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., 17347225 + 13756681 = 4165^2 + 3709^2 .

It is not an unprimeable number, because it can be changed into a prime (31103909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775975 + ... + 7775978.

Almost surely, 2^31103906 is an apocalyptic number.

31103906 is a deficient number, since it is larger than the sum of its proper divisors (15551956).

31103906 is a wasteful number, since it uses less digits than its factorization.

31103906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551955.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 31103906 is about 5577.0875912074. The cubic root of 31103906 is about 314.4886504970.

The spelling of 31103906 in words is "thirty-one million, one hundred three thousand, nine hundred six".