61606251 has 40 divisors (see below), whose sum is σ = 105937920. Its totient is φ = 34949232.

The previous prime is 61606247. The next prime is 61606273. The reversal of 61606251 is 15260616.

It is a happy number.

61606251 is a `hidden beast` number, since 6 + 1 + 606 + 2 + 51 = 666.

61606251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61606251 - 2² = 61606247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61606201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 101190 + ... + 101796.

It is an arithmetic number, because the mean of its divisors is an integer number (2648448).

Almost surely, 2^61606251 is an apocalyptic number.

61606251 is a deficient number, since it is larger than the sum of its proper divisors (44331669).

61606251 is a wasteful number, since it uses less digits than its factorization.

61606251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61606251 is about 7848.9649636114. The cubic root of 61606251 is about 394.9495230056.

Adding to 61606251 its reverse (15260616), we get a palindrome (76866867).

The spelling of 61606251 in words is "sixty-one million, six hundred six thousand, two hundred fifty-one".