261551446 has 32 divisors (see below), whose sum is σ = 452829888. Its totient is φ = 112337280.

The previous prime is 261551441. The next prime is 261551453. The reversal of 261551446 is 644155162.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261551441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16216 + ... + 28036.

It is an arithmetic number, because the mean of its divisors is an integer number (14150934).

Almost surely, 2^261551446 is an apocalyptic number.

261551446 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261551446 is a deficient number, since it is larger than the sum of its proper divisors (191278442).

261551446 is a wasteful number, since it uses less digits than its factorization.

261551446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896.

The product of its digits is 28800, while the sum is 34.

The square root of 261551446 is about 16172.5522413749. The cubic root of 261551446 is about 639.5174145231.

The spelling of 261551446 in words is "two hundred sixty-one million, five hundred fifty-one thousand, four hundred forty-six".