87612389 has 2 divisors, whose sum is σ = 87612390. Its totient is φ = 87612388.

The previous prime is 87612383. The next prime is 87612391. The reversal of 87612389 is 98321678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84916225 + 2696164 = 9215^2 + 1642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87612389 is a prime.

Together with 87612391, it forms a pair of twin primes.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87612383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43806194 + 43806195.

It is an arithmetic number, because the mean of its divisors is an integer number (43806195).

Almost surely, 2^87612389 is an apocalyptic number.

It is an amenable number.

87612389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87612389 is an equidigital number, since it uses as much as digits as its factorization.

87612389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 87612389 is about 9360.1489838570. The cubic root of 87612389 is about 444.1419969629.

The spelling of 87612389 in words is "eighty-seven million, six hundred twelve thousand, three hundred eighty-nine".