61899501 has 8 divisors (see below), whose sum is σ = 82569760. Its totient is φ = 41247792.

The previous prime is 61899469. The next prime is 61899503. The reversal of 61899501 is 10599816.

61899501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

61899501 is a nontrivial binomial coefficient, being equal to C(11127, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61899501 - 2⁵ = 61899469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61899501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61899503) 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, 8346 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (10321220).

Almost surely, 2^61899501 is an apocalyptic number.

61899501 is the 11126-th triangular number.

It is an amenable number.

61899501 is a deficient number, since it is larger than the sum of its proper divisors (20670259).

61899501 is a wasteful number, since it uses less digits than its factorization.

61899501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 61899501 is about 7867.6235929282. The cubic root of 61899501 is about 395.5751936232.

The spelling of 61899501 in words is "sixty-one million, eight hundred ninety-nine thousand, five hundred one".