251543023 has 2 divisors, whose sum is σ = 251543024. Its totient is φ = 251543022.

The previous prime is 251543011. The next prime is 251543029. The reversal of 251543023 is 320345152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251543023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251543029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125771511 + 125771512.

It is an arithmetic number, because the mean of its divisors is an integer number (125771512).

Almost surely, 2^251543023 is an apocalyptic number.

251543023 is a deficient number, since it is larger than the sum of its proper divisors (1).

251543023 is an equidigital number, since it uses as much as digits as its factorization.

251543023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 251543023 is about 15860.1079126215. The cubic root of 251543023 is about 631.2539256953.

Adding to 251543023 its reverse (320345152), we get a palindrome (571888175).

The spelling of 251543023 in words is "two hundred fifty-one million, five hundred forty-three thousand, twenty-three".