149843717 has 4 divisors (see below), whose sum is σ = 151218540. Its totient is φ = 148468896.

The previous prime is 149843713. The next prime is 149843719. The reversal of 149843717 is 717348941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717348941 = 1721 ⋅416821.

It can be written as a sum of positive squares in 2 ways, for example, as 91565761 + 58277956 = 9569^2 + 7634^2 .

It is a cyclic number.

It is not a de Polignac number, because 149843717 - 2² = 149843713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149843711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687248 + ... + 687465.

It is an arithmetic number, because the mean of its divisors is an integer number (37804635).

Almost surely, 2^149843717 is an apocalyptic number.

It is an amenable number.

149843717 is a deficient number, since it is larger than the sum of its proper divisors (1374823).

149843717 is a wasteful number, since it uses less digits than its factorization.

149843717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374822.

The product of its digits is 169344, while the sum is 44.

The square root of 149843717 is about 12241.0668244234. The cubic root of 149843717 is about 531.1446921693.

The spelling of 149843717 in words is "one hundred forty-nine million, eight hundred forty-three thousand, seven hundred seventeen".