681222451 has 24 divisors (see below), whose sum is σ = 864265920. Its totient is φ = 532127232.

The previous prime is 681222413. The next prime is 681222463. The reversal of 681222451 is 154222186.

It is not a de Polignac number, because 681222451 - 2⁷ = 681222323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681222481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43555 + ... + 57091.

It is an arithmetic number, because the mean of its divisors is an integer number (36011080).

Almost surely, 2^681222451 is an apocalyptic number.

681222451 is a deficient number, since it is larger than the sum of its proper divisors (183043469).

681222451 is a wasteful number, since it uses less digits than its factorization.

681222451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13643 (or 13636 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 681222451 is about 26100.2385238143. The cubic root of 681222451 is about 879.8925708217.

The spelling of 681222451 in words is "six hundred eighty-one million, two hundred twenty-two thousand, four hundred fifty-one".