31123011225 has 48 divisors (see below), whose sum is σ = 51699548160. Its totient is φ = 16520808000.

The previous prime is 31123011221. The next prime is 31123011233. The reversal of 31123011225 is 52211032113.

It is not a de Polignac number, because 31123011225 - 2² = 31123011221 is a prime.

It is a super-2 number, since 2×31123011225² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123011221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27039400 + ... + 27040550.

It is an arithmetic number, because the mean of its divisors is an integer number (1077073920).

Almost surely, 2^31123011225 is an apocalyptic number.

It is an amenable number.

31123011225 is a deficient number, since it is larger than the sum of its proper divisors (20576536935).

31123011225 is a wasteful number, since it uses less digits than its factorization.

31123011225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550 (or 2545 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 31123011225 its reverse (52211032113), we get a palindrome (83334043338).

The spelling of 31123011225 in words is "thirty-one billion, one hundred twenty-three million, eleven thousand, two hundred twenty-five".