157815261 has 12 divisors (see below), whose sum is σ = 230169888. Its totient is φ = 104188104.

The previous prime is 157815257. The next prime is 157815277. The reversal of 157815261 is 162518751.

157815261 is a `hidden beast` number, since 1 + 57 + 81 + 526 + 1 = 666.

It is not a de Polignac number, because 157815261 - 2² = 157815257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157815241) 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 11 ways as a sum of consecutive naturals, for example, 84195 + ... + 86048.

It is an arithmetic number, because the mean of its divisors is an integer number (19180824).

Almost surely, 2^157815261 is an apocalyptic number.

It is an amenable number.

157815261 is a deficient number, since it is larger than the sum of its proper divisors (72354627).

157815261 is a wasteful number, since it uses less digits than its factorization.

157815261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170352 (or 170349 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 157815261 is about 12562.4544178278. The cubic root of 157815261 is about 540.4012347196.

The spelling of 157815261 in words is "one hundred fifty-seven million, eight hundred fifteen thousand, two hundred sixty-one".