83870561 has 2 divisors, whose sum is σ = 83870562. Its totient is φ = 83870560.

The previous prime is 83870557. The next prime is 83870603. The reversal of 83870561 is 16507838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62710561 + 21160000 = 7919^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 83870561 - 2² = 83870557 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_4881935 and since 83870561 and 4881935 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (83870551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41935280 + 41935281.

It is an arithmetic number, because the mean of its divisors is an integer number (41935281).

Almost surely, 2^83870561 is an apocalyptic number.

It is an amenable number.

83870561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83870561 is an equidigital number, since it uses as much as digits as its factorization.

83870561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 83870561 is about 9158.0871911115. The cubic root of 83870561 is about 437.7268457333.

The spelling of 83870561 in words is "eighty-three million, eight hundred seventy thousand, five hundred sixty-one".