261157715 has 16 divisors (see below), whose sum is σ = 385710528. Its totient is φ = 165303936.

The previous prime is 261157711. The next prime is 261157727. The reversal of 261157715 is 517751162.

It is not a de Polignac number, because 261157715 - 2² = 261157711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (261157711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286532 + ... + 287441.

It is an arithmetic number, because the mean of its divisors is an integer number (24106908).

Almost surely, 2^261157715 is an apocalyptic number.

261157715 is a deficient number, since it is larger than the sum of its proper divisors (124552813).

261157715 is a wasteful number, since it uses less digits than its factorization.

261157715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573998.

The product of its digits is 14700, while the sum is 35.

The square root of 261157715 is about 16160.3748409497. The cubic root of 261157715 is about 639.1963504900.

The spelling of 261157715 in words is "two hundred sixty-one million, one hundred fifty-seven thousand, seven hundred fifteen".