87399161 has 2 divisors, whose sum is σ = 87399162. Its totient is φ = 87399160.

The previous prime is 87399131. The next prime is 87399163. The reversal of 87399161 is 16199378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 43309561 = 6640^2 + 6581^2 .

It is a cyclic number.

It is not a de Polignac number, because 87399161 - 2⁶ = 87399097 is a prime.

It is a super-2 number, since 2×87399161² = 15277226687007842, which contains 22 as substring.

Together with 87399163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87399163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43699580 + 43699581.

It is an arithmetic number, because the mean of its divisors is an integer number (43699581).

Almost surely, 2^87399161 is an apocalyptic number.

It is an amenable number.

87399161 is a deficient number, since it is larger than the sum of its proper divisors (1).

87399161 is an equidigital number, since it uses as much as digits as its factorization.

87399161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 87399161 is about 9348.7518418236. The cubic root of 87399161 is about 443.7813917884.

The spelling of 87399161 in words is "eighty-seven million, three hundred ninety-nine thousand, one hundred sixty-one".