83487257921 has 2 divisors, whose sum is σ = 83487257922. Its totient is φ = 83487257920.

The previous prime is 83487257767. The next prime is 83487257947. The reversal of 83487257921 is 12975278438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83427967921 + 59290000 = 288839^2 + 7700^2 .

It is a cyclic number.

It is not a de Polignac number, because 83487257921 - 2²² = 83483063617 is a prime.

It is not a weakly prime, because it can be changed into another prime (83487257951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41743628960 + 41743628961.

It is an arithmetic number, because the mean of its divisors is an integer number (41743628961).

Almost surely, 2^83487257921 is an apocalyptic number.

It is an amenable number.

83487257921 is a deficient number, since it is larger than the sum of its proper divisors (1).

83487257921 is an equidigital number, since it uses as much as digits as its factorization.

83487257921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 56.

The spelling of 83487257921 in words is "eighty-three billion, four hundred eighty-seven million, two hundred fifty-seven thousand, nine hundred twenty-one".