63887531 has 2 divisors, whose sum is σ = 63887532. Its totient is φ = 63887530.

The previous prime is 63887489. The next prime is 63887563. The reversal of 63887531 is 13578836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63887531 is a prime.

It is a super-2 number, since 2×63887531² = 8163233234551922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63884531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31943765 + 31943766.

It is an arithmetic number, because the mean of its divisors is an integer number (31943766).

Almost surely, 2^63887531 is an apocalyptic number.

63887531 is a deficient number, since it is larger than the sum of its proper divisors (1).

63887531 is an equidigital number, since it uses as much as digits as its factorization.

63887531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 63887531 is about 7992.9675965814. The cubic root of 63887531 is about 399.7655521957.

The spelling of 63887531 in words is "sixty-three million, eight hundred eighty-seven thousand, five hundred thirty-one".