1187131657 has 8 divisors (see below), whose sum is σ = 1203235200. Its totient is φ = 1171055184.

The previous prime is 1187131601. The next prime is 1187131667. The reversal of 1187131657 is 7561317811.

It is a happy number.

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 1187131657 - 2¹⁵ = 1187098889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187131667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90978 + ... + 103204.

It is an arithmetic number, because the mean of its divisors is an integer number (150404400).

Almost surely, 2^1187131657 is an apocalyptic number.

It is an amenable number.

1187131657 is a deficient number, since it is larger than the sum of its proper divisors (16103543).

1187131657 is a wasteful number, since it uses less digits than its factorization.

1187131657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535.

The product of its digits is 35280, while the sum is 40.

The square root of 1187131657 is about 34454.7769837507. The cubic root of 1187131657 is about 1058.8463944978.

The spelling of 1187131657 in words is "one billion, one hundred eighty-seven million, one hundred thirty-one thousand, six hundred fifty-seven".