61555149 has 6 divisors (see below), whose sum is σ = 88913006. Its totient is φ = 41036760.

The previous prime is 61555127. The next prime is 61555163. The reversal of 61555149 is 94155516.

61555149 is a `hidden beast` number, since 61 + 5 + 551 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52099524 + 9455625 = 7218^2 + 3075^2 .

It is not a de Polignac number, because 61555149 - 2²⁰ = 60506573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419722 + ... + 3419739.

Almost surely, 2^61555149 is an apocalyptic number.

It is an amenable number.

61555149 is a deficient number, since it is larger than the sum of its proper divisors (27357857).

61555149 is a wasteful number, since it uses less digits than its factorization.

61555149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839467 (or 6839464 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 61555149 is about 7845.7089545815. The cubic root of 61555149 is about 394.8402900774.

The spelling of 61555149 in words is "sixty-one million, five hundred fifty-five thousand, one hundred forty-nine".