681732553 has 2 divisors, whose sum is σ = 681732554. Its totient is φ = 681732552.

The previous prime is 681732547. The next prime is 681732593. The reversal of 681732553 is 355237186.

It is an a-pointer prime, because the next prime (681732593) can be obtained adding 681732553 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633679929 + 48052624 = 25173^2 + 6932^2 .

It is a cyclic number.

It is not a de Polignac number, because 681732553 - 2⁹ = 681732041 is a prime.

It is not a weakly prime, because it can be changed into another prime (681732593) 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 as a sum of consecutive naturals, namely, 340866276 + 340866277.

It is an arithmetic number, because the mean of its divisors is an integer number (340866277).

Almost surely, 2^681732553 is an apocalyptic number.

It is an amenable number.

681732553 is a deficient number, since it is larger than the sum of its proper divisors (1).

681732553 is an equidigital number, since it uses as much as digits as its factorization.

681732553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 40.

The square root of 681732553 is about 26110.0086748358. The cubic root of 681732553 is about 880.1121383439.

The spelling of 681732553 in words is "six hundred eighty-one million, seven hundred thirty-two thousand, five hundred fifty-three".