1257207117 has 24 divisors (see below), whose sum is σ = 1785508704. Its totient is φ = 786518304.

The previous prime is 1257207113. The next prime is 1257207167. The reversal of 1257207117 is 7117027521.

It is not a de Polignac number, because 1257207117 - 2² = 1257207113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257207113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76638 + ... + 91584.

It is an arithmetic number, because the mean of its divisors is an integer number (74396196).

Almost surely, 2^1257207117 is an apocalyptic number.

It is an amenable number.

1257207117 is a deficient number, since it is larger than the sum of its proper divisors (528301587).

1257207117 is a wasteful number, since it uses less digits than its factorization.

1257207117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15049 (or 15026 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 33.

The square root of 1257207117 is about 35457.1165917366. The cubic root of 1257207117 is about 1079.2836805211.

The spelling of 1257207117 in words is "one billion, two hundred fifty-seven million, two hundred seven thousand, one hundred seventeen".