261523461 has 32 divisors (see below), whose sum is σ = 380854656. Its totient is φ = 158976000.

The previous prime is 261523447. The next prime is 261523477. The reversal of 261523461 is 164325162.

It is not a de Polignac number, because 261523461 - 2⁶ = 261523397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261523411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378126 + ... + 378816.

It is an arithmetic number, because the mean of its divisors is an integer number (11901708).

Almost surely, 2^261523461 is an apocalyptic number.

It is an amenable number.

261523461 is a deficient number, since it is larger than the sum of its proper divisors (119331195).

261523461 is a wasteful number, since it uses less digits than its factorization.

261523461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933.

The product of its digits is 8640, while the sum is 30.

The square root of 261523461 is about 16171.6870177480. The cubic root of 261523461 is about 639.4946050740.

The spelling of 261523461 in words is "two hundred sixty-one million, five hundred twenty-three thousand, four hundred sixty-one".