149156321 has 2 divisors, whose sum is σ = 149156322. Its totient is φ = 149156320.

The previous prime is 149156299. The next prime is 149156339. The reversal of 149156321 is 123651941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135466321 + 13690000 = 11639^2 + 3700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149156321 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (149156341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74578160 + 74578161.

It is an arithmetic number, because the mean of its divisors is an integer number (74578161).

Almost surely, 2^149156321 is an apocalyptic number.

It is an amenable number.

149156321 is a deficient number, since it is larger than the sum of its proper divisors (1).

149156321 is an equidigital number, since it uses as much as digits as its factorization.

149156321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 149156321 is about 12212.9570948235. The cubic root of 149156321 is about 530.3312525166.

The spelling of 149156321 in words is "one hundred forty-nine million, one hundred fifty-six thousand, three hundred twenty-one".