261465401 has 2 divisors, whose sum is σ = 261465402. Its totient is φ = 261465400.

The previous prime is 261465367. The next prime is 261465437. The reversal of 261465401 is 104564162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193237801 + 68227600 = 13901^2 + 8260^2 .

It is a cyclic number.

It is not a de Polignac number, because 261465401 - 2¹⁴ = 261449017 is a prime.

It is not a weakly prime, because it can be changed into another prime (261465461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130732700 + 130732701.

It is an arithmetic number, because the mean of its divisors is an integer number (130732701).

Almost surely, 2^261465401 is an apocalyptic number.

It is an amenable number.

261465401 is a deficient number, since it is larger than the sum of its proper divisors (1).

261465401 is an equidigital number, since it uses as much as digits as its factorization.

261465401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 261465401 is about 16169.8918054513. The cubic root of 261465401 is about 639.4472775104.

The spelling of 261465401 in words is "two hundred sixty-one million, four hundred sixty-five thousand, four hundred one".