681212373 has 4 divisors (see below), whose sum is σ = 908283168. Its totient is φ = 454141580.

The previous prime is 681212369. The next prime is 681212419. The reversal of 681212373 is 373212186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681212373 - 2² = 681212369 is a prime.

It is a super-2 number, since 2×681212373² = 928100594256582258, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681212303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113535393 + ... + 113535398.

It is an arithmetic number, because the mean of its divisors is an integer number (227070792).

Almost surely, 2^681212373 is an apocalyptic number.

It is an amenable number.

681212373 is a deficient number, since it is larger than the sum of its proper divisors (227070795).

681212373 is a wasteful number, since it uses less digits than its factorization.

681212373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227070794.

The product of its digits is 12096, while the sum is 33.

The square root of 681212373 is about 26100.0454597305. The cubic root of 681212373 is about 879.8882317588. Note that the first 3 decimals are identical.

The spelling of 681212373 in words is "six hundred eighty-one million, two hundred twelve thousand, three hundred seventy-three".