7811961 has 8 divisors (see below), whose sum is σ = 10430880. Its totient is φ = 5200512.

The previous prime is 7811957. The next prime is 7811971. The reversal of 7811961 is 1691187.

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

It is not a de Polignac number, because 7811961 - 2² = 7811957 is a prime.

It is a super-2 number, since 2×7811961² = 122053469331042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7811911) 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, 1386 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (1303860).

Almost surely, 2^7811961 is an apocalyptic number.

It is an amenable number.

7811961 is a deficient number, since it is larger than the sum of its proper divisors (2618919).

7811961 is a wasteful number, since it uses less digits than its factorization.

7811961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735.

The product of its digits is 3024, while the sum is 33.

The square root of 7811961 is about 2794.9885509605. The cubic root of 7811961 is about 198.4205681422.

The spelling of 7811961 in words is "seven million, eight hundred eleven thousand, nine hundred sixty-one".