693881 has 2 divisors, whose sum is σ = 693882. Its totient is φ = 693880.

The previous prime is 693877. The next prime is 693943. The reversal of 693881 is 188396.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 116281 = 760^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 693881 - 2² = 693877 is a prime.

It is a super-2 number, since 2×693881² = 962941684322, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 693881.

It is not a weakly prime, because it can be changed into another prime (693851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346940 + 346941.

It is an arithmetic number, because the mean of its divisors is an integer number (346941).

2⁶⁹³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

693881 is a deficient number, since it is larger than the sum of its proper divisors (1).

693881 is an equidigital number, since it uses as much as digits as its factorization.

693881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 693881 is about 832.9951980654. The cubic root of 693881 is about 88.5309243223.

The spelling of 693881 in words is "six hundred ninety-three thousand, eight hundred eighty-one".