261012157 has 16 divisors (see below), whose sum is σ = 312159232. Its totient is φ = 213528960.

The previous prime is 261012137. The next prime is 261012161. The reversal of 261012157 is 751210162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261012157 is a prime.

It is a super-2 number, since 2×261012157² = 136254692203585298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261012137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7603 + ... + 24079.

It is an arithmetic number, because the mean of its divisors is an integer number (19509952).

Almost surely, 2^261012157 is an apocalyptic number.

It is an amenable number.

261012157 is a deficient number, since it is larger than the sum of its proper divisors (51147075).

261012157 is a wasteful number, since it uses less digits than its factorization.

261012157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16588.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 261012157 is about 16155.8706667267. The cubic root of 261012157 is about 639.0775749662.

The spelling of 261012157 in words is "two hundred sixty-one million, twelve thousand, one hundred fifty-seven".