1691694425 has 6 divisors (see below), whose sum is σ = 2097701118. Its totient is φ = 1353355520.

The previous prime is 1691694421. The next prime is 1691694461. The reversal of 1691694425 is 5244961961.

It can be written as a sum of positive squares in 3 ways, for example, as 297493504 + 1394200921 = 17248^2 + 37339^2 .

It is not a de Polignac number, because 1691694425 - 2² = 1691694421 is a prime.

It is a super-4 number, since 4×1691694425⁴ (a number of 38 digits) contains 4444 as substring.

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 1691694425.

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 5 ways as a sum of consecutive naturals, for example, 33833864 + ... + 33833913.

It is an arithmetic number, because the mean of its divisors is an integer number (349616853).

Almost surely, 2^1691694425 is an apocalyptic number.

It is an amenable number.

1691694425 is a deficient number, since it is larger than the sum of its proper divisors (406006693).

1691694425 is an equidigital number, since it uses as much as digits as its factorization.

1691694425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67667787 (or 67667782 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The square root of 1691694425 is about 41130.2130434551. The cubic root of 1691694425 is about 1191.5363779726.

The spelling of 1691694425 in words is "one billion, six hundred ninety-one million, six hundred ninety-four thousand, four hundred twenty-five".