1261586401 has 8 divisors (see below), whose sum is σ = 1286025984. Its totient is φ = 1237170480.

The previous prime is 1261586393. The next prime is 1261586423. The reversal of 1261586401 is 1046851621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261586401 - 2³ = 1261586393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261586701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132730 + ... + 141916.

It is an arithmetic number, because the mean of its divisors is an integer number (160753248).

Almost surely, 2^1261586401 is an apocalyptic number.

It is an amenable number.

1261586401 is a deficient number, since it is larger than the sum of its proper divisors (24439583).

1261586401 is an equidigital number, since it uses as much as digits as its factorization.

1261586401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11831.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1261586401 is about 35518.8175619628. The cubic root of 1261586401 is about 1080.5354001171.

The spelling of 1261586401 in words is "one billion, two hundred sixty-one million, five hundred eighty-six thousand, four hundred one".