1605252157 has 2 divisors, whose sum is σ = 1605252158. Its totient is φ = 1605252156.

The previous prime is 1605252151. The next prime is 1605252163. The reversal of 1605252157 is 7512525061.

It is a balanced prime because it is at equal distance from previous prime (1605252151) and next prime (1605252163).

It can be written as a sum of positive squares in only one way, i.e., 1466813401 + 138438756 = 38299^2 + 11766^2 .

It is an emirp because it is prime and its reverse (7512525061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1605252157 - 2⁷ = 1605252029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605252151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802626078 + 802626079.

It is an arithmetic number, because the mean of its divisors is an integer number (802626079).

Almost surely, 2^1605252157 is an apocalyptic number.

It is an amenable number.

1605252157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605252157 is an equidigital number, since it uses as much as digits as its factorization.

1605252157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1605252157 is about 40065.5981734954. The cubic root of 1605252157 is about 1170.8854808478.

The spelling of 1605252157 in words is "one billion, six hundred five million, two hundred fifty-two thousand, one hundred fifty-seven".