1231177157 has 8 divisors (see below), whose sum is σ = 1407714816. Its totient is φ = 1054803312.

The previous prime is 1231177153. The next prime is 1231177187. The reversal of 1231177157 is 7517711321.

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 1231177157 - 2² = 1231177153 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 (1231177153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24398 + ... + 55295.

It is an arithmetic number, because the mean of its divisors is an integer number (175964352).

Almost surely, 2^1231177157 is an apocalyptic number.

It is an amenable number.

1231177157 is a deficient number, since it is larger than the sum of its proper divisors (176537659).

1231177157 is an equidigital number, since it uses as much as digits as its factorization.

1231177157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81907.

The product of its digits is 10290, while the sum is 35.

The square root of 1231177157 is about 35088.1341339205. The cubic root of 1231177157 is about 1071.7829641212.

Adding to 1231177157 its reverse (7517711321), we get a palindrome (8748888478).

The spelling of 1231177157 in words is "one billion, two hundred thirty-one million, one hundred seventy-seven thousand, one hundred fifty-seven".