261122508 has 24 divisors (see below), whose sum is σ = 676984560. Its totient is φ = 87040800.

The previous prime is 261122507. The next prime is 261122513. The reversal of 261122508 is 805221162.

It is a happy number.

261122508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (261122507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1208793 + ... + 1209008.

It is an arithmetic number, because the mean of its divisors is an integer number (28207690).

Almost surely, 2^261122508 is an apocalyptic number.

It is an amenable number.

261122508 is an abundant number, since it is smaller than the sum of its proper divisors (415862052).

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

261122508 is a wasteful number, since it uses less digits than its factorization.

261122508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417814 (or 2417806 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 261122508 is about 16159.2855040067. The cubic root of 261122508 is about 639.1676255779.

The spelling of 261122508 in words is "two hundred sixty-one million, one hundred twenty-two thousand, five hundred eight".