1691428693 has 8 divisors (see below), whose sum is σ = 1777543328. Its totient is φ = 1607440464.

The previous prime is 1691428663. The next prime is 1691428703. The reversal of 1691428693 is 3968241961.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1691428693 - 2⁹ = 1691428181 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 (1691428633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529971 + ... + 533152.

It is an arithmetic number, because the mean of its divisors is an integer number (222192916).

Almost surely, 2^1691428693 is an apocalyptic number.

It is an amenable number.

1691428693 is a deficient number, since it is larger than the sum of its proper divisors (86114635).

1691428693 is a wasteful number, since it uses less digits than its factorization.

1691428693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063203.

The product of its digits is 559872, while the sum is 49.

The square root of 1691428693 is about 41126.9825418788. The cubic root of 1691428693 is about 1191.4739857107.

The spelling of 1691428693 in words is "one billion, six hundred ninety-one million, four hundred twenty-eight thousand, six hundred ninety-three".