61989367091 has 4 divisors (see below), whose sum is σ = 62230571112. Its totient is φ = 61748163072.

The previous prime is 61989367057. The next prime is 61989367109. The reversal of 61989367091 is 19076398916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61989367091 - 2¹⁴ = 61989350707 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 61989367091.

It is not an unprimeable number, because it can be changed into a prime (61989367291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120601625 + ... + 120602138.

It is an arithmetic number, because the mean of its divisors is an integer number (15557642778).

Almost surely, 2^61989367091 is an apocalyptic number.

61989367091 is a deficient number, since it is larger than the sum of its proper divisors (241204021).

61989367091 is a wasteful number, since it uses less digits than its factorization.

61989367091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241204020.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The spelling of 61989367091 in words is "sixty-one billion, nine hundred eighty-nine million, three hundred sixty-seven thousand, ninety-one".