87038921 has 2 divisors, whose sum is σ = 87038922. Its totient is φ = 87038920.

The previous prime is 87038909. The next prime is 87038927. The reversal of 87038921 is 12983078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 29278921 = 7600^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 87038921 - 2¹⁰ = 87037897 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (87038927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43519460 + 43519461.

It is an arithmetic number, because the mean of its divisors is an integer number (43519461).

Almost surely, 2^87038921 is an apocalyptic number.

It is an amenable number.

87038921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87038921 is an equidigital number, since it uses as much as digits as its factorization.

87038921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 87038921 is about 9329.4652043941. The cubic root of 87038921 is about 443.1708292548.

The spelling of 87038921 in words is "eighty-seven million, thirty-eight thousand, nine hundred twenty-one".