31331202103 has 4 divisors (see below), whose sum is σ = 32980212760. Its totient is φ = 29682191448.

The previous prime is 31331202083. The next prime is 31331202107. The reversal of 31331202103 is 30120213313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31331202103 - 2¹³ = 31331193911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1649010637 = 31331202103 / (3 + 1 + 3 + 3 + 1 + 2 + 0 + 2 + 1 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331202107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824505300 + ... + 824505337.

It is an arithmetic number, because the mean of its divisors is an integer number (8245053190).

Almost surely, 2^31331202103 is an apocalyptic number.

31331202103 is a deficient number, since it is larger than the sum of its proper divisors (1649010657).

31331202103 is a wasteful number, since it uses less digits than its factorization.

31331202103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649010656.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31331202103 its reverse (30120213313), we get a palindrome (61451415416).

The spelling of 31331202103 in words is "thirty-one billion, three hundred thirty-one million, two hundred two thousand, one hundred three".