7813961 has 4 divisors (see below), whose sum is σ = 7827732. Its totient is φ = 7800192.

The previous prime is 7813957. The next prime is 7813973. The reversal of 7813961 is 1693187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4923961 + 2890000 = 2219^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 7813961 - 2² = 7813957 is a prime.

It is a super-2 number, since 2×7813961² = 122115973019042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7813061) 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, 5996 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (1956933).

Almost surely, 2^7813961 is an apocalyptic number.

It is an amenable number.

7813961 is a deficient number, since it is larger than the sum of its proper divisors (13771).

7813961 is a wasteful number, since it uses less digits than its factorization.

7813961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13770.

The product of its digits is 9072, while the sum is 35.

The square root of 7813961 is about 2795.3463112824. The cubic root of 7813961 is about 198.4374997541.

The spelling of 7813961 in words is "seven million, eight hundred thirteen thousand, nine hundred sixty-one".