691682243 has 32 divisors (see below), whose sum is σ = 842268672. Its totient is φ = 555271200.

The previous prime is 691682237. The next prime is 691682263. The reversal of 691682243 is 342286196.

It is a cyclic number.

It is not a de Polignac number, because 691682243 - 2¹⁶ = 691616707 is a prime.

It is a super-2 number, since 2×691682243² = 956848650563022098, 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 691682243.

It is not an unprimeable number, because it can be changed into a prime (691682203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2552198 + ... + 2552468.

It is an arithmetic number, because the mean of its divisors is an integer number (26320896).

Almost surely, 2^691682243 is an apocalyptic number.

691682243 is a deficient number, since it is larger than the sum of its proper divisors (150586429).

691682243 is a wasteful number, since it uses less digits than its factorization.

691682243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its digits is 124416, while the sum is 41.

The square root of 691682243 is about 26299.8525281037. The cubic root of 691682243 is about 884.3731366865.

The spelling of 691682243 in words is "six hundred ninety-one million, six hundred eighty-two thousand, two hundred forty-three".