387907045621 has 2 divisors, whose sum is σ = 387907045622. Its totient is φ = 387907045620.

The previous prime is 387907045613. The next prime is 387907045649. The reversal of 387907045621 is 126540709783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237401843121 + 150505202500 = 487239^2 + 387950^2 .

It is a cyclic number.

It is not a de Polignac number, because 387907045621 - 2³ = 387907045613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387907045661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193953522810 + 193953522811.

It is an arithmetic number, because the mean of its divisors is an integer number (193953522811).

It is a 1-persistent number, because it is pandigital, but 2⋅387907045621 = 775814091242 is not.

Almost surely, 2^387907045621 is an apocalyptic number.

It is an amenable number.

387907045621 is a deficient number, since it is larger than the sum of its proper divisors (1).

387907045621 is an equidigital number, since it uses as much as digits as its factorization.

387907045621 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 387907045621 in words is "three hundred eighty-seven billion, nine hundred seven million, forty-five thousand, six hundred twenty-one".