1691424461 has 2 divisors, whose sum is σ = 1691424462. Its totient is φ = 1691424460.

The previous prime is 1691424433. The next prime is 1691424463. The reversal of 1691424461 is 1644241961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1566655561 + 124768900 = 39581^2 + 11170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691424461 - 2²⁶ = 1624315597 is a prime.

Together with 1691424463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691424463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845712230 + 845712231.

It is an arithmetic number, because the mean of its divisors is an integer number (845712231).

Almost surely, 2^1691424461 is an apocalyptic number.

It is an amenable number.

1691424461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691424461 is an equidigital number, since it uses as much as digits as its factorization.

1691424461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 1691424461 is about 41126.9310914393. The cubic root of 1691424461 is about 1191.4729920099.

The spelling of 1691424461 in words is "one billion, six hundred ninety-one million, four hundred twenty-four thousand, four hundred sixty-one".