816157949 has 8 divisors (see below), whose sum is σ = 820139040. Its totient is φ = 812187376.

The previous prime is 816157907. The next prime is 816157973. The reversal of 816157949 is 949751618.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816157949 is a prime.

It is a super-2 number, since 2×816157949² = 1332227595431773202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 816157897 and 816157906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816157999) 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, 183419 + ... + 187815.

It is an arithmetic number, because the mean of its divisors is an integer number (102517380).

Almost surely, 2^816157949 is an apocalyptic number.

It is an amenable number.

816157949 is a deficient number, since it is larger than the sum of its proper divisors (3981091).

816157949 is a wasteful number, since it uses less digits than its factorization.

816157949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259.

The product of its digits is 544320, while the sum is 50.

The square root of 816157949 is about 28568.4782408864. The cubic root of 816157949 is about 934.5260350533.

The spelling of 816157949 in words is "eight hundred sixteen million, one hundred fifty-seven thousand, nine hundred forty-nine".