149647691 has 2 divisors, whose sum is σ = 149647692. Its totient is φ = 149647690.

The previous prime is 149647681. The next prime is 149647711. The reversal of 149647691 is 196746941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149647691 - 2²² = 145453387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149647601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74823845 + 74823846.

It is an arithmetic number, because the mean of its divisors is an integer number (74823846).

Almost surely, 2^149647691 is an apocalyptic number.

149647691 is a deficient number, since it is larger than the sum of its proper divisors (1).

149647691 is an equidigital number, since it uses as much as digits as its factorization.

149647691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 149647691 is about 12233.0573038795. The cubic root of 149647691 is about 530.9129760695.

The spelling of 149647691 in words is "one hundred forty-nine million, six hundred forty-seven thousand, six hundred ninety-one".