1002499681 has 8 divisors (see below), whose sum is σ = 1019915624. Its totient is φ = 985115520.

The previous prime is 1002499661. The next prime is 1002499691. The reversal of 1002499681 is 1869942001.

It can be written as a sum of positive squares in 4 ways, for example, as 4950625 + 997549056 = 2225^2 + 31584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1002499681 - 2¹³ = 1002491489 is a prime.

It is a super-2 number, since 2×1002499681² = 2010011220810203522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002499661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60781 + ... + 75493.

It is an arithmetic number, because the mean of its divisors is an integer number (127489453).

Almost surely, 2^1002499681 is an apocalyptic number.

It is an amenable number.

1002499681 is a deficient number, since it is larger than the sum of its proper divisors (17415943).

1002499681 is a wasteful number, since it uses less digits than its factorization.

1002499681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15891.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1002499681 is about 31662.2753604349. The cubic root of 1002499681 is about 1000.8325336953.

The spelling of 1002499681 in words is "one billion, two million, four hundred ninety-nine thousand, six hundred eighty-one".