261122454 has 36 divisors (see below), whose sum is σ = 587521116. Its totient is φ = 86922072.

The previous prime is 261122447. The next prime is 261122483. The reversal of 261122454 is 454221162.

261122454 is a `hidden beast` number, since 2 + 611 + 2 + 2 + 45 + 4 = 666.

261122454 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 17 ways as a sum of consecutive naturals, for example, 355872 + ... + 356604.

It is an arithmetic number, because the mean of its divisors is an integer number (16320031).

Almost surely, 2^261122454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261122454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293760558).

261122454 is an abundant number, since it is smaller than the sum of its proper divisors (326398662).

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

261122454 is an frugal number, since it uses more digits than its factorization.

261122454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483 (or 738 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 261122454 is about 16159.2838331406. The cubic root of 261122454 is about 639.1675815181.

The spelling of 261122454 in words is "two hundred sixty-one million, one hundred twenty-two thousand, four hundred fifty-four".