1257103157 has 8 divisors (see below), whose sum is σ = 1347213696. Its totient is φ = 1169947152.

The previous prime is 1257103153. The next prime is 1257103171. The reversal of 1257103157 is 7513017521.

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 1257103157 - 2² = 1257103153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257103153) 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, 737753 + ... + 739454.

It is an arithmetic number, because the mean of its divisors is an integer number (168401712).

Almost surely, 2^1257103157 is an apocalyptic number.

It is an amenable number.

1257103157 is a deficient number, since it is larger than the sum of its proper divisors (90110539).

1257103157 is a wasteful number, since it uses less digits than its factorization.

1257103157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477267.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 1257103157 is about 35455.6505651779. The cubic root of 1257103157 is about 1079.2539306036.

The spelling of 1257103157 in words is "one billion, two hundred fifty-seven million, one hundred three thousand, one hundred fifty-seven".