681991083 has 20 divisors (see below), whose sum is σ = 1023253440. Its totient is φ = 452662992.

The previous prime is 681991081. The next prime is 681991097. The reversal of 681991083 is 380199186.

It is not a de Polignac number, because 681991083 - 2¹ = 681991081 is a prime.

It is a super-2 number, since 2×681991083² = 930223674583025778, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681991081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 166 + ... + 36932.

It is an arithmetic number, because the mean of its divisors is an integer number (51162672).

Almost surely, 2^681991083 is an apocalyptic number.

681991083 is a deficient number, since it is larger than the sum of its proper divisors (341262357).

681991083 is a wasteful number, since it uses less digits than its factorization.

681991083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37008 (or 36999 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 681991083 is about 26114.9589890545. The cubic root of 681991083 is about 880.2233777803.

The spelling of 681991083 in words is "six hundred eighty-one million, nine hundred ninety-one thousand, eighty-three".