261411645 has 32 divisors (see below), whose sum is σ = 457228800. Its totient is φ = 126482240.

The previous prime is 261411637. The next prime is 261411659. The reversal of 261411645 is 546114162.

It is not a de Polignac number, because 261411645 - 2³ = 261411637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95506 + ... + 98204.

It is an arithmetic number, because the mean of its divisors is an integer number (14288400).

Almost surely, 2^261411645 is an apocalyptic number.

It is an amenable number.

261411645 is a deficient number, since it is larger than the sum of its proper divisors (195817155).

261411645 is a wasteful number, since it uses less digits than its factorization.

261411645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305.

The product of its digits is 5760, while the sum is 30.

The square root of 261411645 is about 16168.2294949076. The cubic root of 261411645 is about 639.4034521021.

The spelling of 261411645 in words is "two hundred sixty-one million, four hundred eleven thousand, six hundred forty-five".