1657319497 has 2 divisors, whose sum is σ = 1657319498. Its totient is φ = 1657319496.

The previous prime is 1657319471. The next prime is 1657319527. The reversal of 1657319497 is 7949137561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1250046736 + 407272761 = 35356^2 + 20181^2 .

It is an emirp because it is prime and its reverse (7949137561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1657319497 - 2¹¹ = 1657317449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1657314497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828659748 + 828659749.

It is an arithmetic number, because the mean of its divisors is an integer number (828659749).

Almost surely, 2^1657319497 is an apocalyptic number.

It is an amenable number.

1657319497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657319497 is an equidigital number, since it uses as much as digits as its factorization.

1657319497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 52.

The square root of 1657319497 is about 40710.1891054316. The cubic root of 1657319497 is about 1183.4104860009.

The spelling of 1657319497 in words is "one billion, six hundred fifty-seven million, three hundred nineteen thousand, four hundred ninety-seven".