61638951 has 8 divisors (see below), whose sum is σ = 89656704. Its totient is φ = 37356920.

The previous prime is 61638931. The next prime is 61638953. The reversal of 61638951 is 15983616.

61638951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61638951 - 2⁹ = 61638439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61638953) 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 7 ways as a sum of consecutive naturals, for example, 933891 + ... + 933956.

It is an arithmetic number, because the mean of its divisors is an integer number (11207088).

Almost surely, 2^61638951 is an apocalyptic number.

61638951 is a deficient number, since it is larger than the sum of its proper divisors (28017753).

61638951 is a wasteful number, since it uses less digits than its factorization.

61638951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867861.

The product of its digits is 38880, while the sum is 39.

The square root of 61638951 is about 7851.0477644707. The cubic root of 61638951 is about 395.0193891033.

The spelling of 61638951 in words is "sixty-one million, six hundred thirty-eight thousand, nine hundred fifty-one".