261080401 has 4 divisors (see below), whose sum is σ = 264226032. Its totient is φ = 257934772.

The previous prime is 261080353. The next prime is 261080423. The reversal of 261080401 is 104080162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261080401 - 2²³ = 252691793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261089401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572691 + ... + 1572856.

It is an arithmetic number, because the mean of its divisors is an integer number (66056508).

Almost surely, 2^261080401 is an apocalyptic number.

It is an amenable number.

261080401 is a deficient number, since it is larger than the sum of its proper divisors (3145631).

261080401 is an equidigital number, since it uses as much as digits as its factorization.

261080401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145630.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 261080401 is about 16157.9825782800. The cubic root of 261080401 is about 639.1332676589.

The spelling of 261080401 in words is "two hundred sixty-one million, eighty thousand, four hundred one".