681021142 has 32 divisors (see below), whose sum is σ = 1093720320. Its totient is φ = 317103840.

The previous prime is 681021097. The next prime is 681021163. The reversal of 681021142 is 241120186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829092 + ... + 829912.

It is an arithmetic number, because the mean of its divisors is an integer number (34178760).

Almost surely, 2^681021142 is an apocalyptic number.

681021142 is a deficient number, since it is larger than the sum of its proper divisors (412699178).

681021142 is a wasteful number, since it uses less digits than its factorization.

681021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 681021142 is about 26096.3817798560. The cubic root of 681021142 is about 879.8058895210.

The spelling of 681021142 in words is "six hundred eighty-one million, twenty-one thousand, one hundred forty-two".