1694625641 has 4 divisors (see below), whose sum is σ = 1740426372. Its totient is φ = 1648824912.

The previous prime is 1694625629. The next prime is 1694625649. The reversal of 1694625641 is 1465264961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465264961 = 829 ⋅1767509.

It can be written as a sum of positive squares in 2 ways, for example, as 744198400 + 950427241 = 27280^2 + 30829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1694625641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1694625592 and 1694625601.

It is not an unprimeable number, because it can be changed into a prime (1694625649) 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, 22900310 + ... + 22900383.

It is an arithmetic number, because the mean of its divisors is an integer number (435106593).

Almost surely, 2^1694625641 is an apocalyptic number.

It is an amenable number.

1694625641 is a deficient number, since it is larger than the sum of its proper divisors (45800731).

1694625641 is an equidigital number, since it uses as much as digits as its factorization.

1694625641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45800730.

The product of its digits is 311040, while the sum is 44.

The square root of 1694625641 is about 41165.8309888189. The cubic root of 1694625641 is about 1192.2241765753.

The spelling of 1694625641 in words is "one billion, six hundred ninety-four million, six hundred twenty-five thousand, six hundred forty-one".