1693667401 has 4 divisors (see below), whose sum is σ = 1734976404. Its totient is φ = 1652358400.

The previous prime is 1693667387. The next prime is 1693667431. The reversal of 1693667401 is 1047663961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1047663961 = 23 ⋅45550607.

It can be written as a sum of positive squares in 2 ways, for example, as 724901776 + 968765625 = 26924^2 + 31125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1693667401 - 2⁹ = 1693666889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1693667431) 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, 20654440 + ... + 20654521.

It is an arithmetic number, because the mean of its divisors is an integer number (433744101).

Almost surely, 2^1693667401 is an apocalyptic number.

It is an amenable number.

1693667401 is a deficient number, since it is larger than the sum of its proper divisors (41309003).

1693667401 is an equidigital number, since it uses as much as digits as its factorization.

1693667401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41309002.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1693667401 is about 41154.1905642670. The cubic root of 1693667401 is about 1191.9994165519. Note that the first 3 decimals are identical.

The spelling of 1693667401 in words is "one billion, six hundred ninety-three million, six hundred sixty-seven thousand, four hundred one".