1281401601 has 4 divisors (see below), whose sum is σ = 1708535472. Its totient is φ = 854267732.

The previous prime is 1281401587. The next prime is 1281401603. The reversal of 1281401601 is 1061041821.

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 1281401601 - 2²¹ = 1279304449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281401603) 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, 213566931 + ... + 213566936.

It is an arithmetic number, because the mean of its divisors is an integer number (427133868).

Almost surely, 2^1281401601 is an apocalyptic number.

It is an amenable number.

1281401601 is a deficient number, since it is larger than the sum of its proper divisors (427133871).

1281401601 is an equidigital number, since it uses as much as digits as its factorization.

1281401601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427133870.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1281401601 is about 35796.6702501783. The cubic root of 1281401601 is about 1086.1632073291.

The spelling of 1281401601 in words is "one billion, two hundred eighty-one million, four hundred one thousand, six hundred one".