251432123 has 2 divisors, whose sum is σ = 251432124. Its totient is φ = 251432122.

The previous prime is 251432081. The next prime is 251432141. The reversal of 251432123 is 321234152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251432123 - 2¹² = 251428027 is a prime.

It is a super-2 number, since 2×251432123² = 126436224952574258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251432323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125716061 + 125716062.

It is an arithmetic number, because the mean of its divisors is an integer number (125716062).

Almost surely, 2^251432123 is an apocalyptic number.

251432123 is a deficient number, since it is larger than the sum of its proper divisors (1).

251432123 is an equidigital number, since it uses as much as digits as its factorization.

251432123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 251432123 is about 15856.6113340777. The cubic root of 251432123 is about 631.1611432227.

Adding to 251432123 its reverse (321234152), we get a palindrome (572666275).

The spelling of 251432123 in words is "two hundred fifty-one million, four hundred thirty-two thousand, one hundred twenty-three".