261191862 has 24 divisors (see below), whose sum is σ = 574364856. Its totient is φ = 85764096.

The previous prime is 261191839. The next prime is 261191863. The reversal of 261191862 is 268191162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261191863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107083 + ... + 109494.

It is an arithmetic number, because the mean of its divisors is an integer number (23931869).

Almost surely, 2^261191862 is an apocalyptic number.

261191862 is an abundant number, since it is smaller than the sum of its proper divisors (313172994).

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

261191862 is a wasteful number, since it uses less digits than its factorization.

261191862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216652 (or 216649 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 261191862 is about 16161.4313103759. The cubic root of 261191862 is about 639.2242080965.

The spelling of 261191862 in words is "two hundred sixty-one million, one hundred ninety-one thousand, eight hundred sixty-two".