149564021 has 2 divisors, whose sum is σ = 149564022. Its totient is φ = 149564020.

The previous prime is 149564017. The next prime is 149564047. The reversal of 149564021 is 120465941.

149564021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 65383396 = 9175^2 + 8086^2 .

It is an emirp because it is prime and its reverse (120465941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149564021 - 2² = 149564017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149564071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74782010 + 74782011.

It is an arithmetic number, because the mean of its divisors is an integer number (74782011).

Almost surely, 2^149564021 is an apocalyptic number.

It is an amenable number.

149564021 is a deficient number, since it is larger than the sum of its proper divisors (1).

149564021 is an equidigital number, since it uses as much as digits as its factorization.

149564021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 149564021 is about 12229.6369937950. The cubic root of 149564021 is about 530.8140108046.

The spelling of 149564021 in words is "one hundred forty-nine million, five hundred sixty-four thousand, twenty-one".