83745561 has 4 divisors (see below), whose sum is σ = 111660752. Its totient is φ = 55830372.

The previous prime is 83745551. The next prime is 83745569. The reversal of 83745561 is 16554738.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83745561 - 2⁷ = 83745433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83745569) 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, 13957591 + ... + 13957596.

It is an arithmetic number, because the mean of its divisors is an integer number (27915188).

Almost surely, 2^83745561 is an apocalyptic number.

It is an amenable number.

83745561 is a deficient number, since it is larger than the sum of its proper divisors (27915191).

83745561 is a wasteful number, since it uses less digits than its factorization.

83745561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27915190.

The product of its digits is 100800, while the sum is 39.

The square root of 83745561 is about 9151.2600771697. The cubic root of 83745561 is about 437.5092761026.

The spelling of 83745561 in words is "eighty-three million, seven hundred forty-five thousand, five hundred sixty-one".