691602043 has 4 divisors (see below), whose sum is σ = 754474968. Its totient is φ = 628729120.

The previous prime is 691602031. The next prime is 691602061. The reversal of 691602043 is 340206196.

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 691602043 - 2²¹ = 689504891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691601996 and 691602014.

It is not an unprimeable number, because it can be changed into a prime (691702043) 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, 31436446 + ... + 31436467.

It is an arithmetic number, because the mean of its divisors is an integer number (188618742).

Almost surely, 2^691602043 is an apocalyptic number.

691602043 is a deficient number, since it is larger than the sum of its proper divisors (62872925).

691602043 is a wasteful number, since it uses less digits than its factorization.

691602043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62872924.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 691602043 is about 26298.3277605250. The cubic root of 691602043 is about 884.3389545806.

The spelling of 691602043 in words is "six hundred ninety-one million, six hundred two thousand, forty-three".