261554044 has 24 divisors (see below), whose sum is σ = 489455568. Its totient is φ = 121862400.

The previous prime is 261554039. The next prime is 261554053. The reversal of 261554044 is 440455162.

It is a happy number.

It is a super-4 number, since 4×261554044⁴ (a number of 35 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261553997 and 261554015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12174 + ... + 25909.

It is an arithmetic number, because the mean of its divisors is an integer number (20393982).

Almost surely, 2^261554044 is an apocalyptic number.

It is an amenable number.

261554044 is a deficient number, since it is larger than the sum of its proper divisors (227901524).

261554044 is a wasteful number, since it uses less digits than its factorization.

261554044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38205 (or 38203 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 261554044 is about 16172.6325624494. The cubic root of 261554044 is about 639.5195319660.

The spelling of 261554044 in words is "two hundred sixty-one million, five hundred fifty-four thousand, forty-four".