261533450 has 48 divisors (see below), whose sum is σ = 499908480. Its totient is φ = 101761920.

The previous prime is 261533449. The next prime is 261533471. The reversal of 261533450 is 54335162.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 287897 + ... + 288803.

It is an arithmetic number, because the mean of its divisors is an integer number (10414760).

Almost surely, 2^261533450 is an apocalyptic number.

261533450 is a deficient number, since it is larger than the sum of its proper divisors (238375030).

261533450 is a wasteful number, since it uses less digits than its factorization.

261533450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 261533450 is about 16171.9958570363. The cubic root of 261533450 is about 639.5027468933.

The spelling of 261533450 in words is "two hundred sixty-one million, five hundred thirty-three thousand, four hundred fifty".