261676157 has 2 divisors, whose sum is σ = 261676158. Its totient is φ = 261676156.

The previous prime is 261676133. The next prime is 261676171. The reversal of 261676157 is 751676162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196728676 + 64947481 = 14026^2 + 8059^2 .

It is a cyclic number.

It is not a de Polignac number, because 261676157 - 2⁸ = 261675901 is a prime.

It is a super-2 number, since 2×261676157² = 136948822284577298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261676127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130838078 + 130838079.

It is an arithmetic number, because the mean of its divisors is an integer number (130838079).

Almost surely, 2^261676157 is an apocalyptic number.

It is an amenable number.

261676157 is a deficient number, since it is larger than the sum of its proper divisors (1).

261676157 is an equidigital number, since it uses as much as digits as its factorization.

261676157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 261676157 is about 16176.4074194489. The cubic root of 261676157 is about 639.6190416725.

The spelling of 261676157 in words is "two hundred sixty-one million, six hundred seventy-six thousand, one hundred fifty-seven".