31103316 has 36 divisors (see below), whose sum is σ = 79252992. Its totient is φ = 10284624.

The previous prime is 31103311. The next prime is 31103381. The reversal of 31103316 is 61330113.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103311) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 1171 + ... + 7973.

It is an arithmetic number, because the mean of its divisors is an integer number (2201472).

It is a self-describing number.

Almost surely, 2^31103316 is an apocalyptic number.

31103316 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31103316 is an abundant number, since it is smaller than the sum of its proper divisors (48149676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31103316 is a wasteful number, since it uses less digits than its factorization.

31103316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940 (or 6935 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 31103316 is about 5577.0346959652. The cubic root of 31103316 is about 314.4866620064.

Adding to 31103316 its reverse (61330113), we get a palindrome (92433429).

The spelling of 31103316 in words is "thirty-one million, one hundred three thousand, three hundred sixteen".