261797454 has 64 divisors (see below), whose sum is σ = 613370880. Its totient is φ = 82605600.

The previous prime is 261797453. The next prime is 261797461. The reversal of 261797454 is 454797162.

261797454 is a `hidden beast` number, since 26 + 179 + 7 + 454 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261797453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124399 + ... + 126485.

It is an arithmetic number, because the mean of its divisors is an integer number (9583920).

Almost surely, 2^261797454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261797454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306685440).

261797454 is an abundant number, since it is smaller than the sum of its proper divisors (351573426).

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

261797454 is a wasteful number, since it uses less digits than its factorization.

261797454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222 (or 2216 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 261797454 is about 16180.1561797159. The cubic root of 261797454 is about 639.7178557781.

It can be divided in two parts, 26179 and 7454, that added together give a palindrome (33633).

The spelling of 261797454 in words is "two hundred sixty-one million, seven hundred ninety-seven thousand, four hundred fifty-four".