261506450 has 12 divisors (see below), whose sum is σ = 486402090. Its totient is φ = 104602560.

The previous prime is 261506429. The next prime is 261506459. The reversal of 261506450 is 54605162.

261506450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 203091001 + 58415449 = 14251^2 + 7643^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261506459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2615015 + ... + 2615114.

Almost surely, 2^261506450 is an apocalyptic number.

261506450 is a deficient number, since it is larger than the sum of its proper divisors (224895640).

261506450 is a wasteful number, since it uses less digits than its factorization.

261506450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230141 (or 5230136 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 261506450 is about 16171.1610591200. The cubic root of 261506450 is about 639.4807392962.

The spelling of 261506450 in words is "two hundred sixty-one million, five hundred six thousand, four hundred fifty".