261965031 has 8 divisors (see below), whose sum is σ = 357806064. Its totient is φ = 170383680.

The previous prime is 261965029. The next prime is 261965047. The reversal of 261965031 is 130569162.

It is a happy number.

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

It is not a de Polignac number, because 261965031 - 2¹ = 261965029 is a prime.

It is a super-2 number, since 2×261965031² = 137251354933661922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261964983 and 261965001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261965071) 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 7 ways as a sum of consecutive naturals, for example, 1064776 + ... + 1065021.

It is an arithmetic number, because the mean of its divisors is an integer number (44725758).

Almost surely, 2^261965031 is an apocalyptic number.

261965031 is a deficient number, since it is larger than the sum of its proper divisors (95841033).

261965031 is a wasteful number, since it uses less digits than its factorization.

261965031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129841.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 261965031 is about 16185.3338241755. Note that the first 3 decimals coincide. The cubic root of 261965031 is about 639.8543214977.

The spelling of 261965031 in words is "two hundred sixty-one million, nine hundred sixty-five thousand, thirty-one".