691862377 has 4 divisors (see below), whose sum is σ = 691936336. Its totient is φ = 691788420.

The previous prime is 691862359. The next prime is 691862383. The reversal of 691862377 is 773268196.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 691862377 - 2¹¹ = 691860329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691862377.

It is not an unprimeable number, because it can be changed into a prime (691062377) 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, 20499 + ... + 42472.

It is an arithmetic number, because the mean of its divisors is an integer number (172984084).

Almost surely, 2^691862377 is an apocalyptic number.

It is an amenable number.

691862377 is a deficient number, since it is larger than the sum of its proper divisors (73959).

691862377 is a wasteful number, since it uses less digits than its factorization.

691862377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73958.

The product of its digits is 762048, while the sum is 49.

The square root of 691862377 is about 26303.2769251285. The cubic root of 691862377 is about 884.4499021112.

The spelling of 691862377 in words is "six hundred ninety-one million, eight hundred sixty-two thousand, three hundred seventy-seven".