690995091 has 8 divisors (see below), whose sum is σ = 946227664. Its totient is φ = 448212960.

The previous prime is 690995089. The next prime is 690995119. The reversal of 690995091 is 190599096.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690995091 - 2¹ = 690995089 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 690995091.

It is not an unprimeable number, because it can be changed into a prime (690995051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3112480 + ... + 3112701.

It is an arithmetic number, because the mean of its divisors is an integer number (118278458).

Almost surely, 2^690995091 is an apocalyptic number.

690995091 is a deficient number, since it is larger than the sum of its proper divisors (255232573).

690995091 is a wasteful number, since it uses less digits than its factorization.

690995091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6225221.

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 690995091 is about 26286.7854824435. The cubic root of 690995091 is about 884.0801793705.

The spelling of 690995091 in words is "six hundred ninety million, nine hundred ninety-five thousand, ninety-one".