149519869 has 2 divisors, whose sum is σ = 149519870. Its totient is φ = 149519868.

The previous prime is 149519807. The next prime is 149519893. The reversal of 149519869 is 968915941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147987225 + 1532644 = 12165^2 + 1238^2 .

It is a cyclic number.

It is not a de Polignac number, because 149519869 - 2¹⁵ = 149487101 is a prime.

It is a super-2 number, since 2×149519869² = 44712382451554322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149519899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74759934 + 74759935.

It is an arithmetic number, because the mean of its divisors is an integer number (74759935).

Almost surely, 2^149519869 is an apocalyptic number.

It is an amenable number.

149519869 is a deficient number, since it is larger than the sum of its proper divisors (1).

149519869 is an equidigital number, since it uses as much as digits as its factorization.

149519869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 52.

The square root of 149519869 is about 12227.8317374750. The cubic root of 149519869 is about 530.7617727360.

The spelling of 149519869 in words is "one hundred forty-nine million, five hundred nineteen thousand, eight hundred sixty-nine".