407990447521 has 2 divisors, whose sum is σ = 407990447522. Its totient is φ = 407990447520.

The previous prime is 407990447483. The next prime is 407990447537. The reversal of 407990447521 is 125744099704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371899946896 + 36090500625 = 609836^2 + 189975^2 .

It is a cyclic number.

It is not a de Polignac number, because 407990447521 - 2¹⁵ = 407990414753 is a prime.

It is not a weakly prime, because it can be changed into another prime (407990447551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203995223760 + 203995223761.

It is an arithmetic number, because the mean of its divisors is an integer number (203995223761).

Almost surely, 2^407990447521 is an apocalyptic number.

It is an amenable number.

407990447521 is a deficient number, since it is larger than the sum of its proper divisors (1).

407990447521 is an equidigital number, since it uses as much as digits as its factorization.

407990447521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 407990447521 in words is "four hundred seven billion, nine hundred ninety million, four hundred forty-seven thousand, five hundred twenty-one".