261961450 has 24 divisors (see below), whose sum is σ = 495241740. Its totient is φ = 103065600.

The previous prime is 261961433. The next prime is 261961451. The reversal of 261961450 is 54169162.

It can be written as a sum of positive squares in 6 ways, for example, as 95628841 + 166332609 = 9779^2 + 12897^2 .

It is a super-2 number, since 2×261961450² = 137247602572205000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261961451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39895 + ... + 45994.

Almost surely, 2^261961450 is an apocalyptic number.

261961450 is a deficient number, since it is larger than the sum of its proper divisors (233280290).

261961450 is a wasteful number, since it uses less digits than its factorization.

261961450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85962 (or 85957 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 261961450 is about 16185.2231989553. The cubic root of 261961450 is about 639.8514059320.

The spelling of 261961450 in words is "two hundred sixty-one million, nine hundred sixty-one thousand, four hundred fifty".