816513151 has 4 divisors (see below), whose sum is σ = 838581112. Its totient is φ = 794445192.

The previous prime is 816513149. The next prime is 816513161. The reversal of 816513151 is 151315618.

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 816513151 - 2¹ = 816513149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816513101) 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, 11033925 + ... + 11033998.

It is an arithmetic number, because the mean of its divisors is an integer number (209645278).

Almost surely, 2^816513151 is an apocalyptic number.

816513151 is a deficient number, since it is larger than the sum of its proper divisors (22067961).

816513151 is a wasteful number, since it uses less digits than its factorization.

816513151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22067960.

The product of its digits is 3600, while the sum is 31.

The square root of 816513151 is about 28574.6942415838. The cubic root of 816513151 is about 934.6615878072.

Adding to 816513151 its reverse (151315618), we get a palindrome (967828769).

It can be divided in two parts, 8165 and 13151, that added together give a square (21316 = 146²).

The spelling of 816513151 in words is "eight hundred sixteen million, five hundred thirteen thousand, one hundred fifty-one".