87121196579 has 2 divisors, whose sum is σ = 87121196580. Its totient is φ = 87121196578.

The previous prime is 87121196551. The next prime is 87121196623. The reversal of 87121196579 is 97569112178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87121196579 is a prime.

It is a super-2 number, since 2×87121196579² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87121196179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43560598289 + 43560598290.

It is an arithmetic number, because the mean of its divisors is an integer number (43560598290).

Almost surely, 2^87121196579 is an apocalyptic number.

87121196579 is a deficient number, since it is larger than the sum of its proper divisors (1).

87121196579 is an equidigital number, since it uses as much as digits as its factorization.

87121196579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 56.

The spelling of 87121196579 in words is "eighty-seven billion, one hundred twenty-one million, one hundred ninety-six thousand, five hundred seventy-nine".