61505149 has 2 divisors, whose sum is σ = 61505150. Its totient is φ = 61505148.

The previous prime is 61505131. The next prime is 61505161. The reversal of 61505149 is 94150516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 196249 = 7830^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 61505149 - 2⁷ = 61505021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61505149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61505189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752574 + 30752575.

It is an arithmetic number, because the mean of its divisors is an integer number (30752575).

Almost surely, 2^61505149 is an apocalyptic number.

It is an amenable number.

61505149 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505149 is an equidigital number, since it uses as much as digits as its factorization.

61505149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 61505149 is about 7842.5218520575. The cubic root of 61505149 is about 394.7333541964.

The spelling of 61505149 in words is "sixty-one million, five hundred five thousand, one hundred forty-nine".