63699971 has 2 divisors, whose sum is σ = 63699972. Its totient is φ = 63699970.

The previous prime is 63699967. The next prime is 63699983. The reversal of 63699971 is 17999636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63699971 - 2² = 63699967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63699271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31849985 + 31849986.

It is an arithmetic number, because the mean of its divisors is an integer number (31849986).

Almost surely, 2^63699971 is an apocalyptic number.

63699971 is a deficient number, since it is larger than the sum of its proper divisors (1).

63699971 is an equidigital number, since it uses as much as digits as its factorization.

63699971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 50.

The square root of 63699971 is about 7981.2261589307. The cubic root of 63699971 is about 399.3739602802.

The spelling of 63699971 in words is "sixty-three million, six hundred ninety-nine thousand, nine hundred seventy-one".