7971961 has 4 divisors (see below), whose sum is σ = 8318592. Its totient is φ = 7625332.

The previous prime is 7971959. The next prime is 7971973. The reversal of 7971961 is 1691797.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1691797 = 1021 ⋅1657.

It is a cyclic number.

It is not a de Polignac number, because 7971961 - 2¹ = 7971959 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7971911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173281 + ... + 173326.

It is an arithmetic number, because the mean of its divisors is an integer number (2079648).

Almost surely, 2^7971961 is an apocalyptic number.

It is an amenable number.

7971961 is a deficient number, since it is larger than the sum of its proper divisors (346631).

7971961 is a wasteful number, since it uses less digits than its factorization.

7971961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346630.

The product of its digits is 23814, while the sum is 40.

The square root of 7971961 is about 2823.4661322566. The cubic root of 7971961 is about 199.7660681528.

The spelling of 7971961 in words is "seven million, nine hundred seventy-one thousand, nine hundred sixty-one".