31243104 has 48 divisors (see below), whose sum is σ = 91128240. Its totient is φ = 10414080.

The previous prime is 31243099. The next prime is 31243111. The reversal of 31243104 is 40134213.

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

It is a super-2 number, since 2×31243104² = 1952263095109632, which contains 22 as substring.

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

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, 17217 + ... + 18944.

It is an arithmetic number, because the mean of its divisors is an integer number (1898505).

Almost surely, 2^31243104 is an apocalyptic number.

It is an amenable number.

31243104 is an abundant number, since it is smaller than the sum of its proper divisors (59885136).

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

31243104 is a wasteful number, since it uses less digits than its factorization.

31243104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36180 (or 36166 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31243104 is about 5589.5531127273. The cubic root of 31243104 is about 314.9570916611.

Adding to 31243104 its reverse (40134213), we get a palindrome (71377317).

The spelling of 31243104 in words is "thirty-one million, two hundred forty-three thousand, one hundred four".