1604691457 has 2 divisors, whose sum is σ = 1604691458. Its totient is φ = 1604691456.

The previous prime is 1604691433. The next prime is 1604691463. The reversal of 1604691457 is 7541964061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1026817936 + 577873521 = 32044^2 + 24039^2 .

It is an emirp because it is prime and its reverse (7541964061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604691457 - 2²³ = 1596302849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1604698457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802345728 + 802345729.

It is an arithmetic number, because the mean of its divisors is an integer number (802345729).

Almost surely, 2^1604691457 is an apocalyptic number.

It is an amenable number.

1604691457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604691457 is an equidigital number, since it uses as much as digits as its factorization.

1604691457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1604691457 is about 40058.6002875787. The cubic root of 1604691457 is about 1170.7491384173.

The spelling of 1604691457 in words is "one billion, six hundred four million, six hundred ninety-one thousand, four hundred fifty-seven".