1691694426 has 8 divisors (see below), whose sum is σ = 3383388864. Its totient is φ = 563898140.

The previous prime is 1691694421. The next prime is 1691694461. The reversal of 1691694426 is 6244961961.

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

1691694426 is an admirable number.

It is a super-3 number, since 3×1691694426³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1691694421) 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, 140974530 + ... + 140974541.

It is an arithmetic number, because the mean of its divisors is an integer number (422923608).

Almost surely, 2^1691694426 is an apocalyptic number.

1691694426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691694426 is a wasteful number, since it uses less digits than its factorization.

1691694426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281949076.

The product of its digits is 559872, while the sum is 48.

The square root of 1691694426 is about 41130.2130556116. The cubic root of 1691694426 is about 1191.5363782074.

The spelling of 1691694426 in words is "one billion, six hundred ninety-one million, six hundred ninety-four thousand, four hundred twenty-six".