80101691 has 4 divisors (see below), whose sum is σ = 81001800. Its totient is φ = 79201584.

The previous prime is 80101661. The next prime is 80101699. The reversal of 80101691 is 19610108.

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 80101691 - 2⁶ = 80101627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80101691.

It is not an unprimeable number, because it can be changed into a prime (80101699) 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, 449921 + ... + 450098.

It is an arithmetic number, because the mean of its divisors is an integer number (20250450).

Almost surely, 2^80101691 is an apocalyptic number.

80101691 is a deficient number, since it is larger than the sum of its proper divisors (900109).

80101691 is an equidigital number, since it uses as much as digits as its factorization.

80101691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900108.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 80101691 is about 8949.9548043552. The cubic root of 80101691 is about 431.0694328846.

Adding to 80101691 its reverse (19610108), we get a palindrome (99711799).

The spelling of 80101691 in words is "eighty million, one hundred one thousand, six hundred ninety-one".