424973621 has 2 divisors, whose sum is σ = 424973622. Its totient is φ = 424973620.

The previous prime is 424973597. The next prime is 424973629. The reversal of 424973621 is 126379424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335292721 + 89680900 = 18311^2 + 9470^2 .

It is a cyclic number.

It is not a de Polignac number, because 424973621 - 2¹⁸ = 424711477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424973629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212486810 + 212486811.

It is an arithmetic number, because the mean of its divisors is an integer number (212486811).

Almost surely, 2^424973621 is an apocalyptic number.

It is an amenable number.

424973621 is a deficient number, since it is larger than the sum of its proper divisors (1).

424973621 is an equidigital number, since it uses as much as digits as its factorization.

424973621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 424973621 is about 20614.8883334351. Note that the first 3 decimals coincide. The cubic root of 424973621 is about 751.8317425023.

The spelling of 424973621 in words is "four hundred twenty-four million, nine hundred seventy-three thousand, six hundred twenty-one".