261051534 has 24 divisors (see below), whose sum is σ = 567442512. Its totient is φ = 86735520.

The previous prime is 261051523. The next prime is 261051547. The reversal of 261051534 is 435150162.

261051534 is a `hidden beast` number, since 2 + 610 + 5 + 15 + 34 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261051498 and 261051507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17719 + ... + 28914.

It is an arithmetic number, because the mean of its divisors is an integer number (23643438).

Almost surely, 2^261051534 is an apocalyptic number.

261051534 is an abundant number, since it is smaller than the sum of its proper divisors (306390978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261051534 is a wasteful number, since it uses less digits than its factorization.

261051534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46952 (or 46949 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261051534 is about 16157.0892799415. The cubic root of 261051534 is about 639.1097110074.

The spelling of 261051534 in words is "two hundred sixty-one million, fifty-one thousand, five hundred thirty-four".