149403691 has 2 divisors, whose sum is σ = 149403692. Its totient is φ = 149403690.

The previous prime is 149403673. The next prime is 149403703. The reversal of 149403691 is 196304941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149403691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149403691.

It is not a weakly prime, because it can be changed into another prime (149403391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74701845 + 74701846.

It is an arithmetic number, because the mean of its divisors is an integer number (74701846).

Almost surely, 2^149403691 is an apocalyptic number.

149403691 is a deficient number, since it is larger than the sum of its proper divisors (1).

149403691 is an equidigital number, since it uses as much as digits as its factorization.

149403691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 149403691 is about 12223.0802582655. The cubic root of 149403691 is about 530.6242685604.

The spelling of 149403691 in words is "one hundred forty-nine million, four hundred three thousand, six hundred ninety-one".