1921273247 has 2 divisors, whose sum is σ = 1921273248. Its totient is φ = 1921273246.

The previous prime is 1921273223. The next prime is 1921273279. The reversal of 1921273247 is 7423721291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921273247 - 2⁶ = 1921273183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921273247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921273297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960636623 + 960636624.

It is an arithmetic number, because the mean of its divisors is an integer number (960636624).

Almost surely, 2^1921273247 is an apocalyptic number.

1921273247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921273247 is an equidigital number, since it uses as much as digits as its factorization.

1921273247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 1921273247 is about 43832.3310696568. The cubic root of 1921273247 is about 1243.1676829548.

The spelling of 1921273247 in words is "one billion, nine hundred twenty-one million, two hundred seventy-three thousand, two hundred forty-seven".