916767989 has 4 divisors (see below), whose sum is σ = 916837740. Its totient is φ = 916698240.

The previous prime is 916767847. The next prime is 916768007. The reversal of 916767989 is 989767619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 989767619 = 71 ⋅13940389.

It can be written as a sum of positive squares in 2 ways, for example, as 46812964 + 869955025 = 6842^2 + 29495^2 .

It is a cyclic number.

It is not a de Polignac number, because 916767989 - 2¹² = 916763893 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 (916763989) 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, 8522 + ... + 43659.

It is an arithmetic number, because the mean of its divisors is an integer number (229209435).

Almost surely, 2^916767989 is an apocalyptic number.

It is an amenable number.

916767989 is a deficient number, since it is larger than the sum of its proper divisors (69751).

916767989 is a wasteful number, since it uses less digits than its factorization.

916767989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69750.

The product of its digits is 10287648, while the sum is 62.

The square root of 916767989 is about 30278.1767780030. The cubic root of 916767989 is about 971.4485704268.

The spelling of 916767989 in words is "nine hundred sixteen million, seven hundred sixty-seven thousand, nine hundred eighty-nine".