31280123215 has 24 divisors (see below), whose sum is σ = 41299506864. Its totient is φ = 22726704000.

The previous prime is 31280123201. The next prime is 31280123219. The reversal of 31280123215 is 51232108213.

It is not a de Polignac number, because 31280123215 - 2¹⁵ = 31280090447 is a prime.

It is a super-2 number, since 2×31280123215² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31280123219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 599940 + ... + 649990.

It is an arithmetic number, because the mean of its divisors is an integer number (1720812786).

Almost surely, 2^31280123215 is an apocalyptic number.

31280123215 is a deficient number, since it is larger than the sum of its proper divisors (10019383649).

31280123215 is a wasteful number, since it uses less digits than its factorization.

31280123215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51111 (or 51100 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 31280123215 in words is "thirty-one billion, two hundred eighty million, one hundred twenty-three thousand, two hundred fifteen".