694242091 has 4 divisors (see below), whose sum is σ = 694441800. Its totient is φ = 694042384.

The previous prime is 694242089. The next prime is 694242119. The reversal of 694242091 is 190242496.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 694242091 - 2¹ = 694242089 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 694242091.

It is not an unprimeable number, because it can be changed into a prime (694242011) 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, 94546 + ... + 101623.

It is an arithmetic number, because the mean of its divisors is an integer number (173610450).

Almost surely, 2^694242091 is an apocalyptic number.

694242091 is a deficient number, since it is larger than the sum of its proper divisors (199709).

694242091 is a wasteful number, since it uses less digits than its factorization.

694242091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199708.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 694242091 is about 26348.4741683461. The cubic root of 694242091 is about 885.4627862477.

The spelling of 694242091 in words is "six hundred ninety-four million, two hundred forty-two thousand, ninety-one".