816149 has 4 divisors (see below), whose sum is σ = 826560. Its totient is φ = 805740.

The previous prime is 816133. The next prime is 816157. The reversal of 816149 is 941618.

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 816149 - 2⁴ = 816133 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816169) 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, 5087 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (206640).

2⁸¹⁶¹⁴⁹ is an apocalyptic number.

It is an amenable number.

816149 is a deficient number, since it is larger than the sum of its proper divisors (10411).

816149 is a wasteful number, since it uses less digits than its factorization.

816149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410.

The product of its digits is 1728, while the sum is 29.

The square root of 816149 is about 903.4096523726. The cubic root of 816149 is about 93.4522619414.

The spelling of 816149 in words is "eight hundred sixteen thousand, one hundred forty-nine".