56761991 has 8 divisors (see below), whose sum is σ = 66685584. Its totient is φ = 47632320.

The previous prime is 56761981. The next prime is 56762039. The reversal of 56761991 is 19916765.

It is a happy number.

56761991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56761991 - 2⁶ = 56761927 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56761981) 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 7 ways as a sum of consecutive naturals, for example, 198326 + ... + 198611.

It is an arithmetic number, because the mean of its divisors is an integer number (8335698).

Almost surely, 2^56761991 is an apocalyptic number.

56761991 is a deficient number, since it is larger than the sum of its proper divisors (9923593).

56761991 is a wasteful number, since it uses less digits than its factorization.

56761991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396961.

The product of its digits is 102060, while the sum is 44.

The square root of 56761991 is about 7534.0554152462. The cubic root of 56761991 is about 384.3137062332.

It can be divided in two parts, 5676 and 1991, that added together give a palindrome (7667).

The spelling of 56761991 in words is "fifty-six million, seven hundred sixty-one thousand, nine hundred ninety-one".