149403391 has 2 divisors, whose sum is σ = 149403392. Its totient is φ = 149403390.

The previous prime is 149403329. The next prime is 149403409. The reversal of 149403391 is 193304941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 149403391 - 2⁹ = 149402879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149403311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74701695 + 74701696.

It is an arithmetic number, because the mean of its divisors is an integer number (74701696).

Almost surely, 2^149403391 is an apocalyptic number.

149403391 is a deficient number, since it is larger than the sum of its proper divisors (1).

149403391 is an equidigital number, since it uses as much as digits as its factorization.

149403391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 149403391 is about 12223.0679863936. The cubic root of 149403391 is about 530.6239133987.

The spelling of 149403391 in words is "one hundred forty-nine million, four hundred three thousand, three hundred ninety-one".