7881091 has 4 divisors (see below), whose sum is σ = 7941384. Its totient is φ = 7820800.

The previous prime is 7881089. The next prime is 7881113. The reversal of 7881091 is 1901887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1901887 = 13 ⋅146299.

It is a cyclic number.

It is not a de Polignac number, because 7881091 - 2¹ = 7881089 is a prime.

It is a super-2 number, since 2×7881091² = 124223190700562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7881031) 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, 29950 + ... + 30211.

It is an arithmetic number, because the mean of its divisors is an integer number (1985346).

Almost surely, 2^7881091 is an apocalyptic number.

7881091 is a deficient number, since it is larger than the sum of its proper divisors (60293).

7881091 is a wasteful number, since it uses less digits than its factorization.

7881091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60292.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 7881091 is about 2807.3280891267. The cubic root of 7881091 is about 199.0041412234.

The spelling of 7881091 in words is "seven million, eight hundred eighty-one thousand, ninety-one".