261932401 has 2 divisors, whose sum is σ = 261932402. Its totient is φ = 261932400.

The previous prime is 261932389. The next prime is 261932417. The reversal of 261932401 is 104239162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248094001 + 13838400 = 15751^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 261932401 - 2⁵ = 261932369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261932401.

It is not a weakly prime, because it can be changed into another prime (261932431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130966200 + 130966201.

It is an arithmetic number, because the mean of its divisors is an integer number (130966201).

Almost surely, 2^261932401 is an apocalyptic number.

It is an amenable number.

261932401 is a deficient number, since it is larger than the sum of its proper divisors (1).

261932401 is an equidigital number, since it uses as much as digits as its factorization.

261932401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 261932401 is about 16184.3257814467. The cubic root of 261932401 is about 639.8277539398.

The spelling of 261932401 in words is "two hundred sixty-one million, nine hundred thirty-two thousand, four hundred one".