261122554 has 64 divisors (see below), whose sum is σ = 514252800. Its totient is φ = 96465600.

The previous prime is 261122551. The next prime is 261122581. The reversal of 261122554 is 455221162.

It is not an unprimeable number, because it can be changed into a prime (261122551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262999 + ... + 263989.

It is an arithmetic number, because the mean of its divisors is an integer number (8035200).

Almost surely, 2^261122554 is an apocalyptic number.

261122554 is a deficient number, since it is larger than the sum of its proper divisors (253130246).

261122554 is a wasteful number, since it uses less digits than its factorization.

261122554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099.

The product of its digits is 4800, while the sum is 28.

The square root of 261122554 is about 16159.2869273369. The cubic root of 261122554 is about 639.1676631104.

The spelling of 261122554 in words is "two hundred sixty-one million, one hundred twenty-two thousand, five hundred fifty-four".