63157561 has 2 divisors, whose sum is σ = 63157562. Its totient is φ = 63157560.

The previous prime is 63157559. The next prime is 63157603. The reversal of 63157561 is 16575136.

63157561 = 5619² + 5620².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31584400 + 31573161 = 5620^2 + 5619^2 .

It is a cyclic number.

It is not a de Polignac number, because 63157561 - 2¹ = 63157559 is a prime.

It is a super-2 number, since 2×63157561² = 7977755022937442, which contains 22 as substring.

Together with 63157559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63157531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31578780 + 31578781.

It is an arithmetic number, because the mean of its divisors is an integer number (31578781).

Almost surely, 2^63157561 is an apocalyptic number.

63157561 is the 5620-th centered square number.

It is an amenable number.

63157561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63157561 is an equidigital number, since it uses as much as digits as its factorization.

63157561 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 63157561 is about 7947.1731452133. The cubic root of 63157561 is about 398.2371611610.

The spelling of 63157561 in words is "sixty-three million, one hundred fifty-seven thousand, five hundred sixty-one".