149969 has 2 divisors, whose sum is σ = 149970. Its totient is φ = 149968.

The previous prime is 149953. The next prime is 149971. The reversal of 149969 is 969941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82369 + 67600 = 287^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 149969 - 2⁴ = 149953 is a prime.

It is a super-2 number, since 2×149969² = 44981401922, which contains 22 as substring.

Together with 149971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74984 + 74985.

It is an arithmetic number, because the mean of its divisors is an integer number (74985).

2¹⁴⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

149969 is a deficient number, since it is larger than the sum of its proper divisors (1).

149969 is an equidigital number, since it uses as much as digits as its factorization.

149969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 149969 is about 387.2583117249. The cubic root of 149969 is about 53.1292679385.

The spelling of 149969 in words is "one hundred forty-nine thousand, nine hundred sixty-nine".