1256431 has 4 divisors (see below), whose sum is σ = 1370664. Its totient is φ = 1142200.

The previous prime is 1256429. The next prime is 1256449. The reversal of 1256431 is 1346521.

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

It is a cyclic number.

It is not a de Polignac number, because 1256431 - 2¹ = 1256429 is a prime.

It is a super-2 number, since 2×1256431² = 3157237715522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256231) 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, 57100 + ... + 57121.

It is an arithmetic number, because the mean of its divisors is an integer number (342666).

2^1256431 is an apocalyptic number.

1256431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1256431 is a deficient number, since it is larger than the sum of its proper divisors (114233).

1256431 is a wasteful number, since it uses less digits than its factorization.

1256431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114232.

The product of its digits is 720, while the sum is 22.

The square root of 1256431 is about 1120.9063297172. The cubic root of 1256431 is about 107.9061541880.

It can be divided in two parts, 125 and 6431, that added together give a palindrome (6556).

The spelling of 1256431 in words is "one million, two hundred fifty-six thousand, four hundred thirty-one".