518031256090 has 12 divisors (see below), whose sum is σ = 932460357834. Its totient is φ = 207211592024.

The previous prime is 518031256073. The next prime is 518031256109. The reversal of 518031256090 is 90652130815.

It can be written as a sum of positive squares in only one way, i.e., 466228130481 + 51803125609 = 682809^2 + 227603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2162229 + ... + 2389831.

Almost surely, 2^518031256090 is an apocalyptic number.

518031256090 is a deficient number, since it is larger than the sum of its proper divisors (414429101744).

518031256090 is an frugal number, since it uses more digits than its factorization.

518031256090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455213 (or 227610 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

Multiplying 518031256090 by its sum of digits (40), we get a square (20721250243600 = 4552060²).

The spelling of 518031256090 in words is "five hundred eighteen billion, thirty-one million, two hundred fifty-six thousand, ninety".