149597561 has 8 divisors (see below), whose sum is σ = 154370664. Its totient is φ = 144878080.

The previous prime is 149597527. The next prime is 149597563. The reversal of 149597561 is 165795941.

It can be written as a sum of positive squares in 4 ways, for example, as 34164025 + 115433536 = 5845^2 + 10744^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149597561 - 2¹⁰ = 149596537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149597563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7700 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (19296333).

Almost surely, 2^149597561 is an apocalyptic number.

It is an amenable number.

149597561 is a deficient number, since it is larger than the sum of its proper divisors (4773103).

149597561 is a wasteful number, since it uses less digits than its factorization.

149597561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26811.

The product of its digits is 340200, while the sum is 47.

The square root of 149597561 is about 12231.0081759436. The cubic root of 149597561 is about 530.8536865036.

The spelling of 149597561 in words is "one hundred forty-nine million, five hundred ninety-seven thousand, five hundred sixty-one".