691349111 has 4 divisors (see below), whose sum is σ = 721407792. Its totient is φ = 661290432.

The previous prime is 691349089. The next prime is 691349137. The reversal of 691349111 is 111943196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691349111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691349411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15029306 + ... + 15029351.

It is an arithmetic number, because the mean of its divisors is an integer number (180351948).

Almost surely, 2^691349111 is an apocalyptic number.

691349111 is a deficient number, since it is larger than the sum of its proper divisors (30058681).

691349111 is a wasteful number, since it uses less digits than its factorization.

691349111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30058680.

The product of its digits is 5832, while the sum is 35.

The square root of 691349111 is about 26293.5184218469. The cubic root of 691349111 is about 884.2311349195.

The spelling of 691349111 in words is "six hundred ninety-one million, three hundred forty-nine thousand, one hundred eleven".