251457043 has 4 divisors (see below), whose sum is σ = 251528688. Its totient is φ = 251385400.

The previous prime is 251456993. The next prime is 251457053. The reversal of 251457043 is 340754152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251457043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251456996 and 251457014.

It is not an unprimeable number, because it can be changed into a prime (251457053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30271 + ... + 37672.

It is an arithmetic number, because the mean of its divisors is an integer number (62882172).

Almost surely, 2^251457043 is an apocalyptic number.

251457043 is a deficient number, since it is larger than the sum of its proper divisors (71645).

251457043 is an equidigital number, since it uses as much as digits as its factorization.

251457043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71644.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 251457043 is about 15857.3971067133. The cubic root of 251457043 is about 631.1819944646.

The spelling of 251457043 in words is "two hundred fifty-one million, four hundred fifty-seven thousand, forty-three".