87581801 has 2 divisors, whose sum is σ = 87581802. Its totient is φ = 87581800.

The previous prime is 87581761. The next prime is 87581831. The reversal of 87581801 is 10818578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78340201 + 9241600 = 8851^2 + 3040^2 .

It is a cyclic number.

It is not a de Polignac number, because 87581801 - 2¹⁰ = 87580777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87581831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43790900 + 43790901.

It is an arithmetic number, because the mean of its divisors is an integer number (43790901).

Almost surely, 2^87581801 is an apocalyptic number.

It is an amenable number.

87581801 is a deficient number, since it is larger than the sum of its proper divisors (1).

87581801 is an equidigital number, since it uses as much as digits as its factorization.

87581801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 87581801 is about 9358.5148928663. The cubic root of 87581801 is about 444.0903033730.

The spelling of 87581801 in words is "eighty-seven million, five hundred eighty-one thousand, eight hundred one".