63145391 has 2 divisors, whose sum is σ = 63145392. Its totient is φ = 63145390.

The previous prime is 63145387. The next prime is 63145403. The reversal of 63145391 is 19354136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63145391 - 2² = 63145387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63145891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31572695 + 31572696.

It is an arithmetic number, because the mean of its divisors is an integer number (31572696).

Almost surely, 2^63145391 is an apocalyptic number.

63145391 is a deficient number, since it is larger than the sum of its proper divisors (1).

63145391 is an equidigital number, since it uses as much as digits as its factorization.

63145391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 63145391 is about 7946.4074272592. The cubic root of 63145391 is about 398.2115803886.

It can be divided in two parts, 63145 and 391, that added together give a palindrome (63536).

The spelling of 63145391 in words is "sixty-three million, one hundred forty-five thousand, three hundred ninety-one".