149879869 has 2 divisors, whose sum is σ = 149879870. Its totient is φ = 149879868.

The previous prime is 149879857. The next prime is 149879879. The reversal of 149879869 is 968978941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149157369 + 722500 = 12213^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 149879869 - 2¹⁹ = 149355581 is a prime.

It is a super-2 number, since 2×149879869² = 44927950262914322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149879839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74939934 + 74939935.

It is an arithmetic number, because the mean of its divisors is an integer number (74939935).

Almost surely, 2^149879869 is an apocalyptic number.

It is an amenable number.

149879869 is a deficient number, since it is larger than the sum of its proper divisors (1).

149879869 is an equidigital number, since it uses as much as digits as its factorization.

149879869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 61.

The square root of 149879869 is about 12242.5434040480. The cubic root of 149879869 is about 531.1874042234.

The spelling of 149879869 in words is "one hundred forty-nine million, eight hundred seventy-nine thousand, eight hundred sixty-nine".