7811212401 has 14 divisors (see below), whose sum is σ = 11711462210. Its totient is φ = 5207474448.

The previous prime is 7811212373. The next prime is 7811212421. The reversal of 7811212401 is 1042121187.

It can be written as a sum of positive squares in only one way, i.e., 7441650225 + 369562176 = 86265^2 + 19224^2 .

It is not a de Polignac number, because 7811212401 - 2⁵ = 7811212369 is a prime.

It is a super-2 number, since 2×7811212401² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7811212421) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 5356756 + ... + 5358213.

It is an arithmetic number, because the mean of its divisors is an integer number (836533015).

Almost surely, 2^7811212401 is an apocalyptic number.

It is an amenable number.

7811212401 is a deficient number, since it is larger than the sum of its proper divisors (3900249809).

7811212401 is an equidigital number, since it uses as much as digits as its factorization.

7811212401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10714987 (or 10714972 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 7811212401 is about 88381.0635883049. The cubic root of 7811212401 is about 1984.1422990506.

Adding to 7811212401 its reverse (1042121187), we get a palindrome (8853333588).

The spelling of 7811212401 in words is "seven billion, eight hundred eleven million, two hundred twelve thousand, four hundred one".