149911969 has 2 divisors, whose sum is σ = 149911970. Its totient is φ = 149911968.

The previous prime is 149911891. The next prime is 149912003. The reversal of 149911969 is 969119941.

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., 105822369 + 44089600 = 10287^2 + 6640^2 .

It is a cyclic number.

It is not a de Polignac number, because 149911969 - 2¹³ = 149903777 is a prime.

It is a super-2 number, since 2×149911969² = 44947196898913922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149911369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74955984 + 74955985.

It is an arithmetic number, because the mean of its divisors is an integer number (74955985).

Almost surely, 2^149911969 is an apocalyptic number.

It is an amenable number.

149911969 is a deficient number, since it is larger than the sum of its proper divisors (1).

149911969 is an equidigital number, since it uses as much as digits as its factorization.

149911969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 49.

The square root of 149911969 is about 12243.8543359516. The cubic root of 149911969 is about 531.2253232552.

The spelling of 149911969 in words is "one hundred forty-nine million, nine hundred eleven thousand, nine hundred sixty-nine".