83787281 has 2 divisors, whose sum is σ = 83787282. Its totient is φ = 83787280.

The previous prime is 83787269. The next prime is 83787311. The reversal of 83787281 is 18278738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74666881 + 9120400 = 8641^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 83787281 - 2⁶ = 83787217 is a prime.

It is a super-2 number, since 2×83787281² = 14040616914745922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83787481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41893640 + 41893641.

It is an arithmetic number, because the mean of its divisors is an integer number (41893641).

Almost surely, 2^83787281 is an apocalyptic number.

It is an amenable number.

83787281 is a deficient number, since it is larger than the sum of its proper divisors (1).

83787281 is an equidigital number, since it uses as much as digits as its factorization.

83787281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 44.

The square root of 83787281 is about 9153.5392608542. The cubic root of 83787281 is about 437.5819161987.

The spelling of 83787281 in words is "eighty-three million, seven hundred eighty-seven thousand, two hundred eighty-one".