63812491 has 2 divisors, whose sum is σ = 63812492. Its totient is φ = 63812490.

The previous prime is 63812461. The next prime is 63812501. The reversal of 63812491 is 19421836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63812491 - 2⁵ = 63812459 is a prime.

It is not a weakly prime, because it can be changed into another prime (63812401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31906245 + 31906246.

It is an arithmetic number, because the mean of its divisors is an integer number (31906246).

Almost surely, 2^63812491 is an apocalyptic number.

63812491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63812491 is an equidigital number, since it uses as much as digits as its factorization.

63812491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 63812491 is about 7988.2720910094. The cubic root of 63812491 is about 399.6089741215.

The spelling of 63812491 in words is "sixty-three million, eight hundred twelve thousand, four hundred ninety-one".