149198717 has 2 divisors, whose sum is σ = 149198718. Its totient is φ = 149198716.

The previous prime is 149198671. The next prime is 149198719. The reversal of 149198717 is 717891941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112487236 + 36711481 = 10606^2 + 6059^2 .

It is a cyclic number.

It is not a de Polignac number, because 149198717 - 2¹² = 149194621 is a prime.

Together with 149198719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149198719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74599358 + 74599359.

It is an arithmetic number, because the mean of its divisors is an integer number (74599359).

Almost surely, 2^149198717 is an apocalyptic number.

It is an amenable number.

149198717 is a deficient number, since it is larger than the sum of its proper divisors (1).

149198717 is an equidigital number, since it uses as much as digits as its factorization.

149198717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 47.

The square root of 149198717 is about 12214.6926690769. The cubic root of 149198717 is about 530.3814946467.

The spelling of 149198717 in words is "one hundred forty-nine million, one hundred ninety-eight thousand, seven hundred seventeen".