999987697 has 2 divisors, whose sum is σ = 999987698. Its totient is φ = 999987696.

The previous prime is 999987631. The next prime is 999987743. The reversal of 999987697 is 796789999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633226896 + 366760801 = 25164^2 + 19151^2 .

It is a cyclic number.

It is not a de Polignac number, because 999987697 - 2¹⁵ = 999954929 is a prime.

It is not a weakly prime, because it can be changed into another prime (999987607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993848 + 499993849.

It is an arithmetic number, because the mean of its divisors is an integer number (499993849).

Almost surely, 2^999987697 is an apocalyptic number.

It is an amenable number.

999987697 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987697 is an equidigital number, since it uses as much as digits as its factorization.

999987697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138883248, while the sum is 73.

The square root of 999987697 is about 31622.5820735752. The cubic root of 999987697 is about 999.9958989832.

The spelling of 999987697 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, six hundred ninety-seven".