1213157357 has 4 divisors (see below), whose sum is σ = 1215486396. Its totient is φ = 1210828320.

The previous prime is 1213157347. The next prime is 1213157411. The reversal of 1213157357 is 7537513121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382046116 + 831111241 = 19546^2 + 28829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213157357 - 2⁶ = 1213157293 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 (1213157327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163738 + ... + 1164779.

It is an arithmetic number, because the mean of its divisors is an integer number (303871599).

Almost surely, 2^1213157357 is an apocalyptic number.

It is an amenable number.

1213157357 is a deficient number, since it is larger than the sum of its proper divisors (2329039).

1213157357 is an equidigital number, since it uses as much as digits as its factorization.

1213157357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329038.

The product of its digits is 22050, while the sum is 35.

The square root of 1213157357 is about 34830.4085103807. The cubic root of 1213157357 is about 1066.5282875935.

The spelling of 1213157357 in words is "one billion, two hundred thirteen million, one hundred fifty-seven thousand, three hundred fifty-seven".