31291104 has 48 divisors (see below), whose sum is σ = 88461072. Its totient is φ = 9627648.

The previous prime is 31291097. The next prime is 31291111. The reversal of 31291104 is 40119213.

It is an interprime number because it is at equal distance from previous prime (31291097) and next prime (31291111).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11289 + ... + 13784.

It is an arithmetic number, because the mean of its divisors is an integer number (1842939).

Almost surely, 2^31291104 is an apocalyptic number.

It is an amenable number.

31291104 is an abundant number, since it is smaller than the sum of its proper divisors (57169968).

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

31291104 is a wasteful number, since it uses less digits than its factorization.

31291104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25099 (or 25091 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31291104 is about 5593.8451891342. The cubic root of 31291104 is about 315.1183027549.

The spelling of 31291104 in words is "thirty-one million, two hundred ninety-one thousand, one hundred four".