1215166157 has 2 divisors, whose sum is σ = 1215166158. Its totient is φ = 1215166156.

The previous prime is 1215166133. The next prime is 1215166163. The reversal of 1215166157 is 7516615121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1105629001 + 109537156 = 33251^2 + 10466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215166157 - 2⁶ = 1215166093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215166357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607583078 + 607583079.

It is an arithmetic number, because the mean of its divisors is an integer number (607583079).

Almost surely, 2^1215166157 is an apocalyptic number.

It is an amenable number.

1215166157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215166157 is an equidigital number, since it uses as much as digits as its factorization.

1215166157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 35.

The square root of 1215166157 is about 34859.2334539932. The cubic root of 1215166157 is about 1067.1166313291.

The spelling of 1215166157 in words is "one billion, two hundred fifteen million, one hundred sixty-six thousand, one hundred fifty-seven".