149681971 has 2 divisors, whose sum is σ = 149681972. Its totient is φ = 149681970.

The previous prime is 149681941. The next prime is 149681993. The reversal of 149681971 is 179186941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 149681971 - 2⁷ = 149681843 is a prime.

It is not a weakly prime, because it can be changed into another prime (149681941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74840985 + 74840986.

It is an arithmetic number, because the mean of its divisors is an integer number (74840986).

Almost surely, 2^149681971 is an apocalyptic number.

149681971 is a deficient number, since it is larger than the sum of its proper divisors (1).

149681971 is an equidigital number, since it uses as much as digits as its factorization.

149681971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 149681971 is about 12234.4583451823. The cubic root of 149681971 is about 530.9535119602.

The spelling of 149681971 in words is "one hundred forty-nine million, six hundred eighty-one thousand, nine hundred seventy-one".