1213139757 has 16 divisors (see below), whose sum is σ = 1688479232. Its totient is φ = 773997120.

The previous prime is 1213139731. The next prime is 1213139773. The reversal of 1213139757 is 7579313121.

It is not a de Polignac number, because 1213139757 - 2¹⁸ = 1212877613 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 (1213132757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82813 + ... + 96354.

It is an arithmetic number, because the mean of its divisors is an integer number (105529952).

Almost surely, 2^1213139757 is an apocalyptic number.

It is an amenable number.

1213139757 is a deficient number, since it is larger than the sum of its proper divisors (475339475).

1213139757 is a wasteful number, since it uses less digits than its factorization.

1213139757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179268.

The product of its digits is 39690, while the sum is 39.

The square root of 1213139757 is about 34830.1558566711. The cubic root of 1213139757 is about 1066.5231299805.

The spelling of 1213139757 in words is "one billion, two hundred thirteen million, one hundred thirty-nine thousand, seven hundred fifty-seven".