1251431 has 2 divisors, whose sum is σ = 1251432. Its totient is φ = 1251430.

The previous prime is 1251427. The next prime is 1251433. The reversal of 1251431 is 1341521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251431 - 2² = 1251427 is a prime.

It is a super-2 number, since 2×1251431² = 3132159095522, which contains 22 as substring.

Together with 1251433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625715 + 625716.

It is an arithmetic number, because the mean of its divisors is an integer number (625716).

2^1251431 is an apocalyptic number.

1251431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251431 is an equidigital number, since it uses as much as digits as its factorization.

1251431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 1251431 is about 1118.6737683525. The cubic root of 1251431 is about 107.7628254392.

Adding to 1251431 its reverse (1341521), we get a palindrome (2592952).

The spelling of 1251431 in words is "one million, two hundred fifty-one thousand, four hundred thirty-one".