1257103231 has 4 divisors (see below), whose sum is σ = 1291079032. Its totient is φ = 1223127432.

The previous prime is 1257103229. The next prime is 1257103271. The reversal of 1257103231 is 1323017521.

It is a happy number.

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 1257103231 - 2¹ = 1257103229 is a prime.

It is a super-2 number, since 2×1257103231² = 3160617066781278722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1257103196 and 1257103205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257103271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16987845 + ... + 16987918.

It is an arithmetic number, because the mean of its divisors is an integer number (322769758).

Almost surely, 2^1257103231 is an apocalyptic number.

1257103231 is a deficient number, since it is larger than the sum of its proper divisors (33975801).

1257103231 is an equidigital number, since it uses as much as digits as its factorization.

1257103231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33975800.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1257103231 is about 35455.6516087351. The cubic root of 1257103231 is about 1079.2539517805.

The spelling of 1257103231 in words is "one billion, two hundred fifty-seven million, one hundred three thousand, two hundred thirty-one".