31280120457 has 8 divisors (see below), whose sum is σ = 42834038976. Its totient is φ = 20289807792.

The previous prime is 31280120449. The next prime is 31280120491. The reversal of 31280120457 is 75402108213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31280120457 - 2³ = 31280120449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31280122457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140901333 + ... + 140901554.

It is an arithmetic number, because the mean of its divisors is an integer number (5354254872).

Almost surely, 2^31280120457 is an apocalyptic number.

31280120457 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31280120457 is a deficient number, since it is larger than the sum of its proper divisors (11553918519).

31280120457 is a wasteful number, since it uses less digits than its factorization.

31280120457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281802927.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 31280120457 in words is "thirty-one billion, two hundred eighty million, one hundred twenty thousand, four hundred fifty-seven".