463521991 has 2 divisors, whose sum is σ = 463521992. Its totient is φ = 463521990.

The previous prime is 463521973. The next prime is 463521997. The reversal of 463521991 is 199125364.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-463521991 is a prime.

It is a super-2 number, since 2×463521991² = 429705272281208162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (463521997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 231760995 + 231760996.

It is an arithmetic number, because the mean of its divisors is an integer number (231760996).

Almost surely, 2^463521991 is an apocalyptic number.

463521991 is a deficient number, since it is larger than the sum of its proper divisors (1).

463521991 is an equidigital number, since it uses as much as digits as its factorization.

463521991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 463521991 is about 21529.5608640771. The cubic root of 463521991 is about 773.9093870869.

The spelling of 463521991 in words is "four hundred sixty-three million, five hundred twenty-one thousand, nine hundred ninety-one".