1021679681 has 8 divisors (see below), whose sum is σ = 1114907328. Its totient is φ = 928510000.

The previous prime is 1021679677. The next prime is 1021679707. The reversal of 1021679681 is 1869761201.

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

It is not a de Polignac number, because 1021679681 - 2² = 1021679677 is a prime.

It is a super-2 number, since 2×1021679681² = 2087658741136523522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021679621) 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, 27731 + ... + 53031.

It is an arithmetic number, because the mean of its divisors is an integer number (139363416).

Almost surely, 2^1021679681 is an apocalyptic number.

1021679681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021679681 is a deficient number, since it is larger than the sum of its proper divisors (93227647).

1021679681 is a wasteful number, since it uses less digits than its factorization.

1021679681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28983.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1021679681 is about 31963.7244544499. The cubic root of 1021679681 is about 1007.1749572002.

Subtracting 1021679681 from its reverse (1869761201), we obtain a triangular number (848081520 = T₄₁₁₈₄).

The spelling of 1021679681 in words is "one billion, twenty-one million, six hundred seventy-nine thousand, six hundred eighty-one".