816401513 has 4 divisors (see below), whose sum is σ = 819286608. Its totient is φ = 813516420.

The previous prime is 816401507. The next prime is 816401543. The reversal of 816401513 is 315104618.

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 816401513 - 2⁴ = 816401497 is a prime.

It is a super-2 number, since 2×816401513² = 1333022860857378338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816401503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442123 + ... + 1442688.

It is an arithmetic number, because the mean of its divisors is an integer number (204821652).

Almost surely, 2^816401513 is an apocalyptic number.

It is an amenable number.

816401513 is a deficient number, since it is larger than the sum of its proper divisors (2885095).

816401513 is a wasteful number, since it uses less digits than its factorization.

816401513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885094.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 816401513 is about 28572.7407330833. The cubic root of 816401513 is about 934.6189885725.

The spelling of 816401513 in words is "eight hundred sixteen million, four hundred one thousand, five hundred thirteen".