999987497 has 2 divisors, whose sum is σ = 999987498. Its totient is φ = 999987496.

The previous prime is 999987487. The next prime is 999987503. The reversal of 999987497 is 794789999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999887641 + 99856 = 31621^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 999987497 - 2⁶ = 999987433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999987497.

It is not a weakly prime, because it can be changed into another prime (999987427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993748 + 499993749.

It is an arithmetic number, because the mean of its divisors is an integer number (499993749).

Almost surely, 2^999987497 is an apocalyptic number.

It is an amenable number.

999987497 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987497 is an equidigital number, since it uses as much as digits as its factorization.

999987497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 71.

The square root of 999987497 is about 31622.5789112779. The cubic root of 999987497 is about 999.9958323160.

The spelling of 999987497 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, four hundred ninety-seven".