261822465 has 12 divisors (see below), whose sum is σ = 453825684. Its totient is φ = 139638624.

The previous prime is 261822461. The next prime is 261822467. The reversal of 261822465 is 564228162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 165173904 + 96648561 = 12852^2 + 9831^2 .

It is not a de Polignac number, because 261822465 - 2² = 261822461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261822461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2909094 + ... + 2909183.

It is an arithmetic number, because the mean of its divisors is an integer number (37818807).

Almost surely, 2^261822465 is an apocalyptic number.

It is an amenable number.

261822465 is a deficient number, since it is larger than the sum of its proper divisors (192003219).

261822465 is a wasteful number, since it uses less digits than its factorization.

261822465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818288 (or 5818285 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 261822465 is about 16180.9290524370. The cubic root of 261822465 is about 639.7382270913.

The spelling of 261822465 in words is "two hundred sixty-one million, eight hundred twenty-two thousand, four hundred sixty-five".