1628605397 has 2 divisors, whose sum is σ = 1628605398. Its totient is φ = 1628605396.

The previous prime is 1628605369. The next prime is 1628605441. The reversal of 1628605397 is 7935068261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1247926276 + 380679121 = 35326^2 + 19511^2 .

It is an emirp because it is prime and its reverse (7935068261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1628605397 - 2⁸ = 1628605141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1628605327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814302698 + 814302699.

It is an arithmetic number, because the mean of its divisors is an integer number (814302699).

Almost surely, 2^1628605397 is an apocalyptic number.

It is an amenable number.

1628605397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628605397 is an equidigital number, since it uses as much as digits as its factorization.

1628605397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1628605397 is about 40355.9834101463. The cubic root of 1628605397 is about 1176.5361882764.

The spelling of 1628605397 in words is "one billion, six hundred twenty-eight million, six hundred five thousand, three hundred ninety-seven".