261422365 has 8 divisors (see below), whose sum is σ = 313970688. Its totient is φ = 208962000.

The previous prime is 261422309. The next prime is 261422377. The reversal of 261422365 is 563224162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261422365 - 2¹³ = 261414173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15261 + ... + 27490.

It is an arithmetic number, because the mean of its divisors is an integer number (39246336).

Almost surely, 2^261422365 is an apocalyptic number.

It is an amenable number.

261422365 is a deficient number, since it is larger than the sum of its proper divisors (52548323).

261422365 is a wasteful number, since it uses less digits than its factorization.

261422365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43979.

The product of its digits is 17280, while the sum is 31.

The square root of 261422365 is about 16168.5610058533. The cubic root of 261422365 is about 639.4121922270.

The spelling of 261422365 in words is "two hundred sixty-one million, four hundred twenty-two thousand, three hundred sixty-five".