261461023 has 4 divisors (see below), whose sum is σ = 264049848. Its totient is φ = 258872200.

The previous prime is 261461017. The next prime is 261461063. The reversal of 261461023 is 320164162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261461023 - 2¹⁷ = 261329951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261461063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294261 + ... + 1294462.

It is an arithmetic number, because the mean of its divisors is an integer number (66012462).

Almost surely, 2^261461023 is an apocalyptic number.

261461023 is a deficient number, since it is larger than the sum of its proper divisors (2588825).

261461023 is a wasteful number, since it uses less digits than its factorization.

261461023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588824.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 261461023 is about 16169.7564298291. The cubic root of 261461023 is about 639.4437085030.

The spelling of 261461023 in words is "two hundred sixty-one million, four hundred sixty-one thousand, twenty-three".