149969221 has 2 divisors, whose sum is σ = 149969222. Its totient is φ = 149969220.

The previous prime is 149969219. The next prime is 149969279. The reversal of 149969221 is 122969941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89984196 + 59985025 = 9486^2 + 7745^2 .

It is a cyclic number.

It is not a de Polignac number, because 149969221 - 2¹ = 149969219 is a prime.

Together with 149969219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149969201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74984610 + 74984611.

It is an arithmetic number, because the mean of its divisors is an integer number (74984611).

Almost surely, 2^149969221 is an apocalyptic number.

It is an amenable number.

149969221 is a deficient number, since it is larger than the sum of its proper divisors (1).

149969221 is an equidigital number, since it uses as much as digits as its factorization.

149969221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 149969221 is about 12246.1921020373. The cubic root of 149969221 is about 531.2929403630.

The spelling of 149969221 in words is "one hundred forty-nine million, nine hundred sixty-nine thousand, two hundred twenty-one".