87200921 has 2 divisors, whose sum is σ = 87200922. Its totient is φ = 87200920.

The previous prime is 87200917. The next prime is 87200929. The reversal of 87200921 is 12900278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83978896 + 3222025 = 9164^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 87200921 - 2² = 87200917 is a prime.

It is not a weakly prime, because it can be changed into another prime (87200929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43600460 + 43600461.

It is an arithmetic number, because the mean of its divisors is an integer number (43600461).

Almost surely, 2^87200921 is an apocalyptic number.

It is an amenable number.

87200921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87200921 is an equidigital number, since it uses as much as digits as its factorization.

87200921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 87200921 is about 9338.1433379446. The cubic root of 87200921 is about 443.4456073957.

The spelling of 87200921 in words is "eighty-seven million, two hundred thousand, nine hundred twenty-one".