87811793 has 2 divisors, whose sum is σ = 87811794. Its totient is φ = 87811792.

The previous prime is 87811781. The next prime is 87811799. The reversal of 87811793 is 39711878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80066704 + 7745089 = 8948^2 + 2783^2 .

It is a cyclic number.

It is not a de Polignac number, because 87811793 - 2¹⁰ = 87810769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87811799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43905896 + 43905897.

It is an arithmetic number, because the mean of its divisors is an integer number (43905897).

Almost surely, 2^87811793 is an apocalyptic number.

It is an amenable number.

87811793 is a deficient number, since it is larger than the sum of its proper divisors (1).

87811793 is an equidigital number, since it uses as much as digits as its factorization.

87811793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 87811793 is about 9370.7946834834. The cubic root of 87811793 is about 444.4786943444.

The spelling of 87811793 in words is "eighty-seven million, eight hundred eleven thousand, seven hundred ninety-three".