83476721 has 2 divisors, whose sum is σ = 83476722. Its totient is φ = 83476720.

The previous prime is 83476711. The next prime is 83476727. The reversal of 83476721 is 12767438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78570496 + 4906225 = 8864^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 83476721 - 2¹⁴ = 83460337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

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

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83476727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41738360 + 41738361.

It is an arithmetic number, because the mean of its divisors is an integer number (41738361).

Almost surely, 2^83476721 is an apocalyptic number.

It is an amenable number.

83476721 is a deficient number, since it is larger than the sum of its proper divisors (1).

83476721 is an equidigital number, since it uses as much as digits as its factorization.

83476721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 83476721 is about 9136.5595822498. The cubic root of 83476721 is about 437.0406101476.

The spelling of 83476721 in words is "eighty-three million, four hundred seventy-six thousand, seven hundred twenty-one".