82607561 has 4 divisors (see below), whose sum is σ = 83202000. Its totient is φ = 82013124.

The previous prime is 82607543. The next prime is 82607563. The reversal of 82607561 is 16570628.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82607561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82607563) 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, 297011 + ... + 297288.

It is an arithmetic number, because the mean of its divisors is an integer number (20800500).

Almost surely, 2^82607561 is an apocalyptic number.

It is an amenable number.

82607561 is a deficient number, since it is larger than the sum of its proper divisors (594439).

82607561 is a wasteful number, since it uses less digits than its factorization.

82607561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594438.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 82607561 is about 9088.8701718090. The cubic root of 82607561 is about 435.5184921515.

The spelling of 82607561 in words is "eighty-two million, six hundred seven thousand, five hundred sixty-one".