87069051721 has 2 divisors, whose sum is σ = 87069051722. Its totient is φ = 87069051720.

The previous prime is 87069051709. The next prime is 87069051733. The reversal of 87069051721 is 12715096078.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (87069051709) and next prime (87069051733).

It can be written as a sum of positive squares in only one way, i.e., 78532215696 + 8536836025 = 280236^2 + 92395^2 .

It is a cyclic number.

It is not a de Polignac number, because 87069051721 - 2²⁹ = 86532180809 is a prime.

It is not a weakly prime, because it can be changed into another prime (87069051761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43534525860 + 43534525861.

It is an arithmetic number, because the mean of its divisors is an integer number (43534525861).

Almost surely, 2^87069051721 is an apocalyptic number.

It is an amenable number.

87069051721 is a deficient number, since it is larger than the sum of its proper divisors (1).

87069051721 is an equidigital number, since it uses as much as digits as its factorization.

87069051721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 87069051721 in words is "eighty-seven billion, sixty-nine million, fifty-one thousand, seven hundred twenty-one".