251749048516 has 27 divisors (see below), whose sum is σ = 512503434639. Its totient is φ = 107889438888.

The previous prime is 251749048513. The next prime is 251749048531. The reversal of 251749048516 is 615840947152.

The square root of 251749048516 is 501746.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×251749048516² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251749048511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7006525 + ... + 7042363.

Almost surely, 2^251749048516 is an apocalyptic number.

251749048516 is the 501746-th square number.

It is an amenable number.

251749048516 is an abundant number, since it is smaller than the sum of its proper divisors (260754386123).

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

251749048516 is an frugal number, since it uses more digits than its factorization.

251749048516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71696 (or 35848 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 251749048516 in words is "two hundred fifty-one billion, seven hundred forty-nine million, forty-eight thousand, five hundred sixteen".