31625221152 has 48 divisors (see below), whose sum is σ = 94875665472. Its totient is φ = 9035777280.

The previous prime is 31625221097. The next prime is 31625221153. The reversal of 31625221152 is 25112252613.

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

It is a super-2 number, since 2×31625221152² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31625221153) 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 7 ways as a sum of consecutive naturals, for example, 23529999 + ... + 23531342.

It is an arithmetic number, because the mean of its divisors is an integer number (1976576364).

Almost surely, 2^31625221152 is an apocalyptic number.

31625221152 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31625221152 is an abundant number, since it is smaller than the sum of its proper divisors (63250444320).

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

31625221152 is a wasteful number, since it uses less digits than its factorization.

31625221152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47061361 (or 47061353 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

Adding to 31625221152 its reverse (25112252613), we get a palindrome (56737473765).

The spelling of 31625221152 in words is "thirty-one billion, six hundred twenty-five million, two hundred twenty-one thousand, one hundred fifty-two".