1257231 has 8 divisors (see below), whose sum is σ = 1704960. Its totient is φ = 823832.

The previous prime is 1257229. The next prime is 1257233. The reversal of 1257231 is 1327521.

It is an interprime number because it is at equal distance from previous prime (1257229) and next prime (1257233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1257231 - 2¹ = 1257229 is a prime.

It is a super-2 number, since 2×1257231² = 3161259574722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1257198 and 1257207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3375 + ... + 3728.

It is an arithmetic number, because the mean of its divisors is an integer number (213120).

2^1257231 is an apocalyptic number.

1257231 is a deficient number, since it is larger than the sum of its proper divisors (447729).

1257231 is an equidigital number, since it uses as much as digits as its factorization.

1257231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165.

The product of its digits is 420, while the sum is 21.

The square root of 1257231 is about 1121.2631270135. The cubic root of 1257231 is about 107.9290514815.

The spelling of 1257231 in words is "one million, two hundred fifty-seven thousand, two hundred thirty-one".