1921471429 has 2 divisors, whose sum is σ = 1921471430. Its totient is φ = 1921471428.

The previous prime is 1921471399. The next prime is 1921471441. The reversal of 1921471429 is 9241741291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1393528900 + 527942529 = 37330^2 + 22977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921471429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921471391 and 1921471400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921471459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960735714 + 960735715.

It is an arithmetic number, because the mean of its divisors is an integer number (960735715).

Almost surely, 2^1921471429 is an apocalyptic number.

It is an amenable number.

1921471429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921471429 is an equidigital number, since it uses as much as digits as its factorization.

1921471429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 1921471429 is about 43834.5916942316. The cubic root of 1921471429 is about 1243.2104263087.

The spelling of 1921471429 in words is "one billion, nine hundred twenty-one million, four hundred seventy-one thousand, four hundred twenty-nine".