149161021 has 2 divisors, whose sum is σ = 149161022. Its totient is φ = 149161020.

The previous prime is 149160959. The next prime is 149161031. The reversal of 149161021 is 120161941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 11356900 = 11739^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 149161021 - 2⁹ = 149160509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149161031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74580510 + 74580511.

It is an arithmetic number, because the mean of its divisors is an integer number (74580511).

Almost surely, 2^149161021 is an apocalyptic number.

It is an amenable number.

149161021 is a deficient number, since it is larger than the sum of its proper divisors (1).

149161021 is an equidigital number, since it uses as much as digits as its factorization.

149161021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 149161021 is about 12213.1495118990. The cubic root of 149161021 is about 530.3368228040.

The spelling of 149161021 in words is "one hundred forty-nine million, one hundred sixty-one thousand, twenty-one".