149401691 has 2 divisors, whose sum is σ = 149401692. Its totient is φ = 149401690.

The previous prime is 149401669. The next prime is 149401709. The reversal of 149401691 is 196104941.

It is a strong prime.

It is an emirp because it is prime and its reverse (196104941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149401691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (149403691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74700845 + 74700846.

It is an arithmetic number, because the mean of its divisors is an integer number (74700846).

Almost surely, 2^149401691 is an apocalyptic number.

149401691 is a deficient number, since it is larger than the sum of its proper divisors (1).

149401691 is an equidigital number, since it uses as much as digits as its factorization.

149401691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 149401691 is about 12222.9984455534. The cubic root of 149401691 is about 530.6219008070.

The spelling of 149401691 in words is "one hundred forty-nine million, four hundred one thousand, six hundred ninety-one".