1636246397 has 2 divisors, whose sum is σ = 1636246398. Its totient is φ = 1636246396.

The previous prime is 1636246357. The next prime is 1636246457. The reversal of 1636246397 is 7936426361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1394723716 + 241522681 = 37346^2 + 15541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1636246397 - 2¹⁸ = 1635984253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1636246357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 818123198 + 818123199.

It is an arithmetic number, because the mean of its divisors is an integer number (818123199).

Almost surely, 2^1636246397 is an apocalyptic number.

It is an amenable number.

1636246397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1636246397 is an equidigital number, since it uses as much as digits as its factorization.

1636246397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 47.

The square root of 1636246397 is about 40450.5426045189. The cubic root of 1636246397 is about 1178.3733204440.

The spelling of 1636246397 in words is "one billion, six hundred thirty-six million, two hundred forty-six thousand, three hundred ninety-seven".