63190991 has 2 divisors, whose sum is σ = 63190992. Its totient is φ = 63190990.

The previous prime is 63190961. The next prime is 63190993. The reversal of 63190991 is 19909136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63190991 - 2¹⁴ = 63174607 is a prime.

Together with 63190993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63190993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31595495 + 31595496.

It is an arithmetic number, because the mean of its divisors is an integer number (31595496).

Almost surely, 2^63190991 is an apocalyptic number.

63190991 is a deficient number, since it is larger than the sum of its proper divisors (1).

63190991 is an equidigital number, since it uses as much as digits as its factorization.

63190991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 63190991 is about 7949.2761305669. The cubic root of 63190991 is about 398.3074125548.

The spelling of 63190991 in words is "sixty-three million, one hundred ninety thousand, nine hundred ninety-one".