1020423449 has 2 divisors, whose sum is σ = 1020423450. Its totient is φ = 1020423448.

The previous prime is 1020423409. The next prime is 1020423479. The reversal of 1020423449 is 9443240201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542563849 + 477859600 = 23293^2 + 21860^2 .

It is an emirp because it is prime and its reverse (9443240201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020423449 - 2⁸ = 1020423193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020423409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510211724 + 510211725.

It is an arithmetic number, because the mean of its divisors is an integer number (510211725).

Almost surely, 2^1020423449 is an apocalyptic number.

It is an amenable number.

1020423449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020423449 is an equidigital number, since it uses as much as digits as its factorization.

1020423449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1020423449 is about 31944.0675086940. The cubic root of 1020423449 is about 1006.7619887783.

The spelling of 1020423449 in words is "one billion, twenty million, four hundred twenty-three thousand, four hundred forty-nine".