261101072 has 20 divisors (see below), whose sum is σ = 506671440. Its totient is φ = 130347168.

The previous prime is 261101063. The next prime is 261101131. The reversal of 261101072 is 270101162.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1838 + ... + 22925.

It is an arithmetic number, because the mean of its divisors is an integer number (25333572).

Almost surely, 2^261101072 is an apocalyptic number.

It is an amenable number.

261101072 is a deficient number, since it is larger than the sum of its proper divisors (245570368).

261101072 is a wasteful number, since it uses less digits than its factorization.

261101072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25430 (or 25424 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 261101072 is about 16158.6222184938. The cubic root of 261101072 is about 639.1501349726.

The spelling of 261101072 in words is "two hundred sixty-one million, one hundred one thousand, seventy-two".