261195963 has 16 divisors (see below), whose sum is σ = 399438336. Its totient is φ = 148720320.

The previous prime is 261195959. The next prime is 261196003. The reversal of 261195963 is 369591162.

It is not a de Polignac number, because 261195963 - 2² = 261195959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261195943) 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, 16231 + ... + 28032.

It is an arithmetic number, because the mean of its divisors is an integer number (24964896).

Almost surely, 2^261195963 is an apocalyptic number.

261195963 is a deficient number, since it is larger than the sum of its proper divisors (138242373).

261195963 is a wasteful number, since it uses less digits than its factorization.

261195963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44554.

The product of its digits is 87480, while the sum is 42.

The square root of 261195963 is about 16161.5581860166. The cubic root of 261195963 is about 639.2275535871.

The spelling of 261195963 in words is "two hundred sixty-one million, one hundred ninety-five thousand, nine hundred sixty-three".