149421191 has 2 divisors, whose sum is σ = 149421192. Its totient is φ = 149421190.

The previous prime is 149421163. The next prime is 149421193. The reversal of 149421191 is 191124941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 149421191 - 2¹⁴ = 149404807 is a prime.

Together with 149421193, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_8413673 and since 149421191 and 8413673 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149421193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74710595 + 74710596.

It is an arithmetic number, because the mean of its divisors is an integer number (74710596).

Almost surely, 2^149421191 is an apocalyptic number.

149421191 is a deficient number, since it is larger than the sum of its proper divisors (1).

149421191 is an equidigital number, since it uses as much as digits as its factorization.

149421191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 149421191 is about 12223.7960961397. The cubic root of 149421191 is about 530.6449855010.

The spelling of 149421191 in words is "one hundred forty-nine million, four hundred twenty-one thousand, one hundred ninety-one".