61989901 has 4 divisors (see below), whose sum is σ = 62283904. Its totient is φ = 61695900.

The previous prime is 61989877. The next prime is 61989919. The reversal of 61989901 is 10998916.

61989901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61989901 - 2¹¹ = 61987853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61989931) 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 3 ways as a sum of consecutive naturals, for example, 146685 + ... + 147106.

It is an arithmetic number, because the mean of its divisors is an integer number (15570976).

Almost surely, 2^61989901 is an apocalyptic number.

It is an amenable number.

61989901 is a deficient number, since it is larger than the sum of its proper divisors (294003).

61989901 is a wasteful number, since it uses less digits than its factorization.

61989901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294002.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 61989901 is about 7873.3665607540. The cubic root of 61989901 is about 395.7676701520.

The spelling of 61989901 in words is "sixty-one million, nine hundred eighty-nine thousand, nine hundred one".