261112572 has 90 divisors (see below), whose sum is σ = 794092992. Its totient is φ = 74599056.

The previous prime is 261112543. The next prime is 261112613. The reversal of 261112572 is 275211162.

261112572 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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7653 + ... + 24099.

Almost surely, 2^261112572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261112572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397046496).

261112572 is an abundant number, since it is smaller than the sum of its proper divisors (532980420).

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

261112572 is a wasteful number, since it uses less digits than its factorization.

261112572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16477 (or 16459 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 261112572 is about 16158.9780617464. The cubic root of 261112572 is about 639.1595184636.

The spelling of 261112572 in words is "two hundred sixty-one million, one hundred twelve thousand, five hundred seventy-two".