149399561 has 8 divisors (see below), whose sum is σ = 154689480. Its totient is φ = 144118912.

The previous prime is 149399557. The next prime is 149399567. The reversal of 149399561 is 165993941.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43309561 + 106090000 = 6581^2 + 10300^2 .

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 149399561 - 2² = 149399557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149399567) 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, 54131 + ... + 56823.

It is an arithmetic number, because the mean of its divisors is an integer number (19336185).

Almost surely, 2^149399561 is an apocalyptic number.

It is an amenable number.

149399561 is a deficient number, since it is larger than the sum of its proper divisors (5289919).

149399561 is a wasteful number, since it uses less digits than its factorization.

149399561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4635.

The product of its digits is 262440, while the sum is 47.

The square root of 149399561 is about 12222.9113144128. The cubic root of 149399561 is about 530.6193791265.

The spelling of 149399561 in words is "one hundred forty-nine million, three hundred ninety-nine thousand, five hundred sixty-one".