261173465 has 32 divisors (see below), whose sum is σ = 380920320. Its totient is φ = 167814144.

The previous prime is 261173459. The next prime is 261173467. The reversal of 261173465 is 564371162.

261173465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 261173465 - 2¹² = 261169369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (261173467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155651 + ... + 157319.

It is an arithmetic number, because the mean of its divisors is an integer number (11903760).

Almost surely, 2^261173465 is an apocalyptic number.

It is an amenable number.

261173465 is a deficient number, since it is larger than the sum of its proper divisors (119746855).

261173465 is a wasteful number, since it uses less digits than its factorization.

261173465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961.

The product of its digits is 30240, while the sum is 35.

The square root of 261173465 is about 16160.8621366560. The cubic root of 261173465 is about 639.2091998649.

The spelling of 261173465 in words is "two hundred sixty-one million, one hundred seventy-three thousand, four hundred sixty-five".