261193042 has 32 divisors (see below), whose sum is σ = 452003328. Its totient is φ = 112080000.

The previous prime is 261193013. The next prime is 261193043. The reversal of 261193042 is 240391162.

It is a self number, because there is not a number n which added to its sum of digits gives 261193042.

It is not an unprimeable number, because it can be changed into a prime (261193043) 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, 23292 + ... + 32632.

It is an arithmetic number, because the mean of its divisors is an integer number (14125104).

Almost surely, 2^261193042 is an apocalyptic number.

261193042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261193042 is a deficient number, since it is larger than the sum of its proper divisors (190810286).

261193042 is a wasteful number, since it uses less digits than its factorization.

261193042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 261193042 is about 16161.4678170023. The cubic root of 261193042 is about 639.2251707138.

It can be divided in two parts, 26119 and 3042, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 261193042 in words is "two hundred sixty-one million, one hundred ninety-three thousand, forty-two".