82851561 has 48 divisors (see below), whose sum is σ = 135862272. Its totient is φ = 48297600.

The previous prime is 82851541. The next prime is 82851577. The reversal of 82851561 is 16515828.

82851561 is a `hidden beast` number, since 82 + 8 + 515 + 61 = 666.

It is not a de Polignac number, because 82851561 - 2¹⁵ = 82818793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82851511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192016 + ... + 192446.

It is an arithmetic number, because the mean of its divisors is an integer number (2830464).

Almost surely, 2^82851561 is an apocalyptic number.

It is an amenable number.

82851561 is a deficient number, since it is larger than the sum of its proper divisors (53010711).

82851561 is a wasteful number, since it uses less digits than its factorization.

82851561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 82851561 is about 9102.2832849786. The cubic root of 82851561 is about 435.9468712442.

The spelling of 82851561 in words is "eighty-two million, eight hundred fifty-one thousand, five hundred sixty-one".