149691317 has 2 divisors, whose sum is σ = 149691318. Its totient is φ = 149691316.

The previous prime is 149691313. The next prime is 149691331. The reversal of 149691317 is 713196941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95433361 + 54257956 = 9769^2 + 7366^2 .

It is a cyclic number.

It is not a de Polignac number, because 149691317 - 2² = 149691313 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149691313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74845658 + 74845659.

It is an arithmetic number, because the mean of its divisors is an integer number (74845659).

Almost surely, 2^149691317 is an apocalyptic number.

It is an amenable number.

149691317 is a deficient number, since it is larger than the sum of its proper divisors (1).

149691317 is an equidigital number, since it uses as much as digits as its factorization.

149691317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 149691317 is about 12234.8402931955. The cubic root of 149691317 is about 530.9645624744.

The spelling of 149691317 in words is "one hundred forty-nine million, six hundred ninety-one thousand, three hundred seventeen".