61535791 has 4 divisors (see below), whose sum is σ = 61619800. Its totient is φ = 61451784.

The previous prime is 61535779. The next prime is 61535821. The reversal of 61535791 is 19753516.

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 61535791 - 2⁵ = 61535759 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 61535791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61535731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40896 + ... + 42373.

It is an arithmetic number, because the mean of its divisors is an integer number (15404950).

Almost surely, 2^61535791 is an apocalyptic number.

61535791 is a deficient number, since it is larger than the sum of its proper divisors (84009).

61535791 is an equidigital number, since it uses as much as digits as its factorization.

61535791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84008.

The product of its digits is 28350, while the sum is 37.

The square root of 61535791 is about 7844.4751895841. The cubic root of 61535791 is about 394.7988956540.

It can be divided in two parts, 61535 and 791, that added together give a palindrome (62326).

The spelling of 61535791 in words is "sixty-one million, five hundred thirty-five thousand, seven hundred ninety-one".