816625381 has 8 divisors (see below), whose sum is σ = 959392224. Its totient is φ = 685279920.

The previous prime is 816625333. The next prime is 816625393. The reversal of 816625381 is 183526618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816625381 - 2⁷ = 816625253 is a prime.

It is a super-2 number, since 2×816625381² = 1333754025786790322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816625781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2855191 + ... + 2855476.

It is an arithmetic number, because the mean of its divisors is an integer number (119924028).

Almost surely, 2^816625381 is an apocalyptic number.

It is an amenable number.

816625381 is a deficient number, since it is larger than the sum of its proper divisors (142766843).

816625381 is a wasteful number, since it uses less digits than its factorization.

816625381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710691.

The product of its digits is 69120, while the sum is 40.

The square root of 816625381 is about 28576.6579746478. The cubic root of 816625381 is about 934.7044090258.

The spelling of 816625381 in words is "eight hundred sixteen million, six hundred twenty-five thousand, three hundred eighty-one".