261451530 has 64 divisors (see below), whose sum is σ = 721267200. Its totient is φ = 67314240.

The previous prime is 261451523. The next prime is 261451537. The reversal of 261451530 is 35154162.

261451530 is a `hidden beast` number, since 2 + 614 + 5 + 15 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (261451523) and next prime (261451537).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261451494 and 261451503.

It is not an unprimeable number, because it can be changed into a prime (261451537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8866 + ... + 24525.

It is an arithmetic number, because the mean of its divisors is an integer number (11269800).

Almost surely, 2^261451530 is an apocalyptic number.

261451530 is an abundant number, since it is smaller than the sum of its proper divisors (459815670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261451530 is a wasteful number, since it uses less digits than its factorization.

261451530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33436 (or 33430 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261451530 is about 16169.4628853280. The cubic root of 261451530 is about 639.4359695387.

The spelling of 261451530 in words is "two hundred sixty-one million, four hundred fifty-one thousand, five hundred thirty".