261465031 has 4 divisors (see below), whose sum is σ = 261632200. Its totient is φ = 261297864.

The previous prime is 261465011. The next prime is 261465091. The reversal of 261465031 is 130564162.

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 261465031 - 2⁵ = 261464999 is a prime.

It is a super-2 number, since 2×261465031² = 136727924871661922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261465011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81216 + ... + 84373.

It is an arithmetic number, because the mean of its divisors is an integer number (65408050).

Almost surely, 2^261465031 is an apocalyptic number.

261465031 is a deficient number, since it is larger than the sum of its proper divisors (167169).

261465031 is a wasteful number, since it uses less digits than its factorization.

261465031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167168.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261465031 is about 16169.8803644307. The cubic root of 261465031 is about 639.4469758827.

The spelling of 261465031 in words is "two hundred sixty-one million, four hundred sixty-five thousand, thirty-one".