149931979 has 2 divisors, whose sum is σ = 149931980. Its totient is φ = 149931978.

The previous prime is 149931953. The next prime is 149932019. The reversal of 149931979 is 979139941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149931979 - 2¹⁷ = 149800907 is a prime.

It is not a weakly prime, because it can be changed into another prime (149931919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74965989 + 74965990.

It is an arithmetic number, because the mean of its divisors is an integer number (74965990).

Almost surely, 2^149931979 is an apocalyptic number.

149931979 is a deficient number, since it is larger than the sum of its proper divisors (1).

149931979 is an equidigital number, since it uses as much as digits as its factorization.

149931979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 52.

The square root of 149931979 is about 12244.6714533302. The cubic root of 149931979 is about 531.2489578941.

The spelling of 149931979 in words is "one hundred forty-nine million, nine hundred thirty-one thousand, nine hundred seventy-nine".