7961381 has 4 divisors (see below), whose sum is σ = 8307552. Its totient is φ = 7615212.

The previous prime is 7961363. The next prime is 7961411. The reversal of 7961381 is 1831697.

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 a cyclic number.

It is not a de Polignac number, because 7961381 - 2²² = 3767077 is a prime.

It is a super-2 number, since 2×7961381² = 126767174854322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7961281) 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, 173051 + ... + 173096.

It is an arithmetic number, because the mean of its divisors is an integer number (2076888).

Almost surely, 2^7961381 is an apocalyptic number.

It is an amenable number.

7961381 is a deficient number, since it is larger than the sum of its proper divisors (346171).

7961381 is a wasteful number, since it uses less digits than its factorization.

7961381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346170.

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

The square root of 7961381 is about 2821.5919265549. The cubic root of 7961381 is about 199.6776557500.

The spelling of 7961381 in words is "seven million, nine hundred sixty-one thousand, three hundred eighty-one".