149694821 has 2 divisors, whose sum is σ = 149694822. Its totient is φ = 149694820.

The previous prime is 149694791. The next prime is 149694841. The reversal of 149694821 is 128496941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122965921 + 26728900 = 11089^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 149694821 - 2⁶ = 149694757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149694841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74847410 + 74847411.

It is an arithmetic number, because the mean of its divisors is an integer number (74847411).

Almost surely, 2^149694821 is an apocalyptic number.

It is an amenable number.

149694821 is a deficient number, since it is larger than the sum of its proper divisors (1).

149694821 is an equidigital number, since it uses as much as digits as its factorization.

149694821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 149694821 is about 12234.9834899766. The cubic root of 149694821 is about 530.9687054119.

The spelling of 149694821 in words is "one hundred forty-nine million, six hundred ninety-four thousand, eight hundred twenty-one".