149817601 has 4 divisors (see below), whose sum is σ = 150594052. Its totient is φ = 149041152.

The previous prime is 149817587. The next prime is 149817631. The reversal of 149817601 is 106718941.

It is a Cunningham number, because it is equal to 12240²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36288576 + 113529025 = 6024^2 + 10655^2 .

It is a cyclic number.

It is not a de Polignac number, because 149817601 - 2⁹ = 149817089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149817631) 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, 387936 + ... + 388321.

It is an arithmetic number, because the mean of its divisors is an integer number (37648513).

Almost surely, 2^149817601 is an apocalyptic number.

It is an amenable number.

149817601 is a deficient number, since it is larger than the sum of its proper divisors (776451).

149817601 is an equidigital number, since it uses as much as digits as its factorization.

149817601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776450.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 149817601 is about 12240.0000408497. Note that the first 4 decimals coincide. The cubic root of 149817601 is about 531.1138329492.

The spelling of 149817601 in words is "one hundred forty-nine million, eight hundred seventeen thousand, six hundred one".