1009732421 has 2 divisors, whose sum is σ = 1009732422. Its totient is φ = 1009732420.

The previous prime is 1009732369. The next prime is 1009732429. The reversal of 1009732421 is 1242379001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1009650625 + 81796 = 31775^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009732421 - 2¹⁰ = 1009731397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009732429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504866210 + 504866211.

It is an arithmetic number, because the mean of its divisors is an integer number (504866211).

Almost surely, 2^1009732421 is an apocalyptic number.

It is an amenable number.

1009732421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009732421 is an equidigital number, since it uses as much as digits as its factorization.

1009732421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1009732421 is about 31776.2870864423. The cubic root of 1009732421 is about 1003.2336724249.

The spelling of 1009732421 in words is "one billion, nine million, seven hundred thirty-two thousand, four hundred twenty-one".