916155391 has 2 divisors, whose sum is σ = 916155392. Its totient is φ = 916155390.

The previous prime is 916155341. The next prime is 916155413. The reversal of 916155391 is 193551619.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916155391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916155341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458077695 + 458077696.

It is an arithmetic number, because the mean of its divisors is an integer number (458077696).

Almost surely, 2^916155391 is an apocalyptic number.

916155391 is a deficient number, since it is larger than the sum of its proper divisors (1).

916155391 is an equidigital number, since it uses as much as digits as its factorization.

916155391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 40.

The square root of 916155391 is about 30268.0589235583. The cubic root of 916155391 is about 971.2321434205.

The spelling of 916155391 in words is "nine hundred sixteen million, one hundred fifty-five thousand, three hundred ninety-one".