8191651 has 4 divisors (see below), whose sum is σ = 8821792. Its totient is φ = 7561512.

The previous prime is 8191643. The next prime is 8191691. The reversal of 8191651 is 1561918.

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

It is a cyclic number.

It is not a de Polignac number, because 8191651 - 2³ = 8191643 is a prime.

It is a super-2 number, since 2×8191651² = 134206292211602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8191691) 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, 315051 + ... + 315076.

It is an arithmetic number, because the mean of its divisors is an integer number (2205448).

Almost surely, 2^8191651 is an apocalyptic number.

8191651 is a deficient number, since it is larger than the sum of its proper divisors (630141).

8191651 is a wasteful number, since it uses less digits than its factorization.

8191651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630140.

The product of its digits is 2160, while the sum is 31.

The square root of 8191651 is about 2862.1060427594. The cubic root of 8191651 is about 201.5845052313.

The spelling of 8191651 in words is "eight million, one hundred ninety-one thousand, six hundred fifty-one".