802415891 has 4 divisors (see below), whose sum is σ = 802507800. Its totient is φ = 802323984.

The previous prime is 802415851. The next prime is 802415941. The reversal of 802415891 is 198514208.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-802415891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (802415851) 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, 31301 + ... + 50838.

It is an arithmetic number, because the mean of its divisors is an integer number (200626950).

Almost surely, 2^802415891 is an apocalyptic number.

802415891 is a deficient number, since it is larger than the sum of its proper divisors (91909).

802415891 is an equidigital number, since it uses as much as digits as its factorization.

802415891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91908.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 802415891 is about 28326.9463761981. The cubic root of 802415891 is about 929.2512920365.

The spelling of 802415891 in words is "eight hundred two million, four hundred fifteen thousand, eight hundred ninety-one".