61505147 has 24 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 51202800.

The previous prime is 61505131. The next prime is 61505149. The reversal of 61505147 is 74150516.

It is not a de Polignac number, because 61505147 - 2⁴ = 61505131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70838 + ... + 71700.

It is an arithmetic number, because the mean of its divisors is an integer number (3064320).

Almost surely, 2^61505147 is an apocalyptic number.

61505147 is a deficient number, since it is larger than the sum of its proper divisors (12038533).

61505147 is a wasteful number, since it uses less digits than its factorization.

61505147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 61505147 is about 7842.5217245475. The cubic root of 61505147 is about 394.7333499178.

The spelling of 61505147 in words is "sixty-one million, five hundred five thousand, one hundred forty-seven".