261122645 has 16 divisors (see below), whose sum is σ = 366847488. Its totient is φ = 174687360.

The previous prime is 261122633. The next prime is 261122671. The reversal of 261122645 is 546221162.

261122645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261122645 - 2⁴ = 261122629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89549 + ... + 92418.

It is an arithmetic number, because the mean of its divisors is an integer number (22927968).

Almost surely, 2^261122645 is an apocalyptic number.

It is an amenable number.

261122645 is a deficient number, since it is larger than the sum of its proper divisors (105724843).

261122645 is a wasteful number, since it uses less digits than its factorization.

261122645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182020.

The product of its digits is 5760, while the sum is 29.

The square root of 261122645 is about 16159.2897430549. The cubic root of 261122645 is about 639.1677373593.

The spelling of 261122645 in words is "two hundred sixty-one million, one hundred twenty-two thousand, six hundred forty-five".