61000038791 has 4 divisors (see below), whose sum is σ = 61002025800. Its totient is φ = 60998051784.

The previous prime is 61000038773. The next prime is 61000038851. The reversal of 61000038791 is 19783000016.

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 61000038791 - 2⁶ = 61000038727 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 (61000038721) 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, 946721 + ... + 1009098.

It is an arithmetic number, because the mean of its divisors is an integer number (15250506450).

Almost surely, 2^61000038791 is an apocalyptic number.

61000038791 is a deficient number, since it is larger than the sum of its proper divisors (1987009).

61000038791 is a wasteful number, since it uses less digits than its factorization.

61000038791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987008.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 61000038791 in words is "sixty-one billion, thirty-eight thousand, seven hundred ninety-one".