261325965 has 16 divisors (see below), whose sum is σ = 419328000. Its totient is φ = 138971712.

The previous prime is 261325963. The next prime is 261325973. The reversal of 261325965 is 569523162.

261325965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261325965 - 2¹ = 261325963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261325963) 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, 19725 + ... + 30194.

It is an arithmetic number, because the mean of its divisors is an integer number (26208000).

Almost surely, 2^261325965 is an apocalyptic number.

It is an amenable number.

261325965 is a deficient number, since it is larger than the sum of its proper divisors (158002035).

261325965 is a wasteful number, since it uses less digits than its factorization.

261325965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50276.

The product of its digits is 97200, while the sum is 39.

The square root of 261325965 is about 16165.5796369942. The cubic root of 261325965 is about 639.3335877391. Note that the first 3 decimals are identical.

The spelling of 261325965 in words is "two hundred sixty-one million, three hundred twenty-five thousand, nine hundred sixty-five".