1188628157 has 2 divisors, whose sum is σ = 1188628158. Its totient is φ = 1188628156.

The previous prime is 1188628153. The next prime is 1188628169. The reversal of 1188628157 is 7518268811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1119638521 + 68989636 = 33461^2 + 8306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188628157 - 2² = 1188628153 is a prime.

It is a super-2 number, since 2×1188628157² = 2825673791226433298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1188628153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594314078 + 594314079.

It is an arithmetic number, because the mean of its divisors is an integer number (594314079).

Almost surely, 2^1188628157 is an apocalyptic number.

It is an amenable number.

1188628157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188628157 is an equidigital number, since it uses as much as digits as its factorization.

1188628157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 47.

The square root of 1188628157 is about 34476.4870165161. The cubic root of 1188628157 is about 1059.2911354697.

The spelling of 1188628157 in words is "one billion, one hundred eighty-eight million, six hundred twenty-eight thousand, one hundred fifty-seven".