149719697 has 4 divisors (see below), whose sum is σ = 158526756. Its totient is φ = 140912640.

The previous prime is 149719651. The next prime is 149719727. The reversal of 149719697 is 796917941.

It is a Cunningham number, because it is equal to 12236²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796917941 = 29 ⋅27479929.

It can be written as a sum of positive squares in 2 ways, for example, as 116553616 + 33166081 = 10796^2 + 5759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149719697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149719637) 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, 4403504 + ... + 4403537.

It is an arithmetic number, because the mean of its divisors is an integer number (39631689).

Almost surely, 2^149719697 is an apocalyptic number.

149719697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

149719697 is a deficient number, since it is larger than the sum of its proper divisors (8807059).

149719697 is an equidigital number, since it uses as much as digits as its factorization.

149719697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807058.

The product of its digits is 857304, while the sum is 53.

The square root of 149719697 is about 12236.0000408630. Note that the first 4 decimals coincide. The cubic root of 149719697 is about 530.9981155719.

The spelling of 149719697 in words is "one hundred forty-nine million, seven hundred nineteen thousand, six hundred ninety-seven".