1277120401 has 4 divisors (see below), whose sum is σ = 1285578304. Its totient is φ = 1268662500.

The previous prime is 1277120389. The next prime is 1277120413. The reversal of 1277120401 is 1040217721.

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 an interprime number because it is at equal distance from previous prime (1277120389) and next prime (1277120413).

It is a cyclic number.

It is not a de Polignac number, because 1277120401 - 2¹⁵ = 1277087633 is a prime.

It is a super-3 number, since 3×1277120401³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1277120491) 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, 4228725 + ... + 4229026.

It is an arithmetic number, because the mean of its divisors is an integer number (321394576).

Almost surely, 2^1277120401 is an apocalyptic number.

It is an amenable number.

1277120401 is a deficient number, since it is larger than the sum of its proper divisors (8457903).

1277120401 is an equidigital number, since it uses as much as digits as its factorization.

1277120401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8457902.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 1277120401 is about 35736.8213611675. The cubic root of 1277120401 is about 1084.9522233983.

The spelling of 1277120401 in words is "one billion, two hundred seventy-seven million, one hundred twenty thousand, four hundred one".