1213056157 has 8 divisors (see below), whose sum is σ = 1227108960. Its totient is φ = 1199043600.

The previous prime is 1213056149. The next prime is 1213056181. The reversal of 1213056157 is 7516503121.

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 1213056157 - 2³ = 1213056149 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 (1213056857) 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, 52818 + ... + 72220.

It is an arithmetic number, because the mean of its divisors is an integer number (153388620).

Almost surely, 2^1213056157 is an apocalyptic number.

It is an amenable number.

1213056157 is a deficient number, since it is larger than the sum of its proper divisors (14052803).

1213056157 is a wasteful number, since it uses less digits than its factorization.

1213056157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20123.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1213056157 is about 34828.9557265216. The cubic root of 1213056157 is about 1066.4986306372.

Adding to 1213056157 its reverse (7516503121), we get a palindrome (8729559278).

The spelling of 1213056157 in words is "one billion, two hundred thirteen million, fifty-six thousand, one hundred fifty-seven".