149661971 has 2 divisors, whose sum is σ = 149661972. Its totient is φ = 149661970.

The previous prime is 149661913. The next prime is 149662049. The reversal of 149661971 is 179166941.

It is a happy number.

149661971 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149661971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149661571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74830985 + 74830986.

It is an arithmetic number, because the mean of its divisors is an integer number (74830986).

Almost surely, 2^149661971 is an apocalyptic number.

149661971 is a deficient number, since it is larger than the sum of its proper divisors (1).

149661971 is an equidigital number, since it uses as much as digits as its factorization.

149661971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 149661971 is about 12233.6409543521. The cubic root of 149661971 is about 530.9298628345.

The spelling of 149661971 in words is "one hundred forty-nine million, six hundred sixty-one thousand, nine hundred seventy-one".