31321004 has 48 divisors (see below), whose sum is σ = 68203296. Its totient is φ = 12364800.

The previous prime is 31320997. The next prime is 31321013. The reversal of 31321004 is 40012313.

31321004 = T₁₄₇ + T₁₄₈ + ... + T₅₇₅.

It is a self number, because there is not a number n which added to its sum of digits gives 31321004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8114 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (1420902).

Almost surely, 2^31321004 is an apocalyptic number.

31321004 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

31321004 is an abundant number, since it is smaller than the sum of its proper divisors (36882292).

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

31321004 is a wasteful number, since it uses less digits than its factorization.

31321004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266 (or 3264 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31321004 is about 5596.5171312165. The cubic root of 31321004 is about 315.2186405142.

Adding to 31321004 its reverse (40012313), we get a palindrome (71333317).

The spelling of 31321004 in words is "thirty-one million, three hundred twenty-one thousand, four".