149664973 has 2 divisors, whose sum is σ = 149664974. Its totient is φ = 149664972.

The previous prime is 149664971. The next prime is 149664989. The reversal of 149664973 is 379466941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138227049 + 11437924 = 11757^2 + 3382^2 .

It is a cyclic number.

It is not a de Polignac number, because 149664973 - 2¹ = 149664971 is a prime.

Together with 149664971, 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 (149664971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74832486 + 74832487.

It is an arithmetic number, because the mean of its divisors is an integer number (74832487).

Almost surely, 2^149664973 is an apocalyptic number.

It is an amenable number.

149664973 is a deficient number, since it is larger than the sum of its proper divisors (1).

149664973 is an equidigital number, since it uses as much as digits as its factorization.

149664973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 49.

The square root of 149664973 is about 12233.7636481992. The cubic root of 149664973 is about 530.9334127026.

The spelling of 149664973 in words is "one hundred forty-nine million, six hundred sixty-four thousand, nine hundred seventy-three".