961599261 has 16 divisors (see below), whose sum is σ = 1512562688. Its totient is φ = 531759600.

The previous prime is 961599229. The next prime is 961599293. The reversal of 961599261 is 162995169.

It is an interprime number because it is at equal distance from previous prime (961599229) and next prime (961599293).

It is not a de Polignac number, because 961599261 - 2⁵ = 961599229 is a prime.

It is a super-2 number, since 2×961599261² = 1849346277511492242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 961599261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961599761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737905 + ... + 739206.

It is an arithmetic number, because the mean of its divisors is an integer number (94535168).

Almost surely, 2^961599261 is an apocalyptic number.

It is an amenable number.

961599261 is a deficient number, since it is larger than the sum of its proper divisors (550963427).

961599261 is a wasteful number, since it uses less digits than its factorization.

961599261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477152.

The product of its digits is 262440, while the sum is 48.

The square root of 961599261 is about 31009.6639936649. The cubic root of 961599261 is about 987.0323198223.

The spelling of 961599261 in words is "nine hundred sixty-one million, five hundred ninety-nine thousand, two hundred sixty-one".