61789791 has 16 divisors (see below), whose sum is σ = 94468608. Its totient is φ = 35191200.

The previous prime is 61789759. The next prime is 61789801. The reversal of 61789791 is 19798716.

It is a happy number.

It is not a de Polignac number, because 61789791 - 2⁵ = 61789759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61789791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61789751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1801 + ... + 11261.

It is an arithmetic number, because the mean of its divisors is an integer number (5904288).

Almost surely, 2^61789791 is an apocalyptic number.

61789791 is a deficient number, since it is larger than the sum of its proper divisors (32678817).

61789791 is a wasteful number, since it uses less digits than its factorization.

61789791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782.

The product of its digits is 190512, while the sum is 48.

The square root of 61789791 is about 7860.6482557102. The cubic root of 61789791 is about 395.3413510301.

The spelling of 61789791 in words is "sixty-one million, seven hundred eighty-nine thousand, seven hundred ninety-one".