1635213157 has 2 divisors, whose sum is σ = 1635213158. Its totient is φ = 1635213156.

The previous prime is 1635213137. The next prime is 1635213191. The reversal of 1635213157 is 7513125361.

It is an a-pointer prime, because the next prime (1635213191) can be obtained adding 1635213157 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1582925796 + 52287361 = 39786^2 + 7231^2 .

It is a cyclic number.

It is not a de Polignac number, because 1635213157 - 2¹⁵ = 1635180389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1635213137) 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, 817606578 + 817606579.

It is an arithmetic number, because the mean of its divisors is an integer number (817606579).

Almost surely, 2^1635213157 is an apocalyptic number.

It is an amenable number.

1635213157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1635213157 is an equidigital number, since it uses as much as digits as its factorization.

1635213157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 34.

The square root of 1635213157 is about 40437.7689419186. The cubic root of 1635213157 is about 1178.1252325394.

The spelling of 1635213157 in words is "one billion, six hundred thirty-five million, two hundred thirteen thousand, one hundred fifty-seven".