694263981 has 16 divisors (see below), whose sum is σ = 938336256. Its totient is φ = 456552816.

The previous prime is 694263979. The next prime is 694263989. The reversal of 694263981 is 189362496.

It is not a de Polignac number, because 694263981 - 2¹ = 694263979 is a prime.

It is a super-2 number, since 2×694263981² = 964004950627936722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 694263981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694263989) 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 15 ways as a sum of consecutive naturals, for example, 76996 + ... + 85538.

It is an arithmetic number, because the mean of its divisors is an integer number (58646016).

Almost surely, 2^694263981 is an apocalyptic number.

It is an amenable number.

694263981 is a deficient number, since it is larger than the sum of its proper divisors (244072275).

694263981 is a wasteful number, since it uses less digits than its factorization.

694263981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8912.

The product of its digits is 559872, while the sum is 48.

The square root of 694263981 is about 26348.8895591446. The cubic root of 694263981 is about 885.4720925963.

The spelling of 694263981 in words is "six hundred ninety-four million, two hundred sixty-three thousand, nine hundred eighty-one".