63491761 has 2 divisors, whose sum is σ = 63491762. Its totient is φ = 63491760.

The previous prime is 63491717. The next prime is 63491797. The reversal of 63491761 is 16719436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39137536 + 24354225 = 6256^2 + 4935^2 .

It is a cyclic number.

It is not a de Polignac number, because 63491761 - 2¹³ = 63483569 is a prime.

It is a super-2 number, since 2×63491761² = 8062407429762242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63491761.

It is not a weakly prime, because it can be changed into another prime (63491261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31745880 + 31745881.

It is an arithmetic number, because the mean of its divisors is an integer number (31745881).

Almost surely, 2^63491761 is an apocalyptic number.

It is an amenable number.

63491761 is a deficient number, since it is larger than the sum of its proper divisors (1).

63491761 is an equidigital number, since it uses as much as digits as its factorization.

63491761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 63491761 is about 7968.1717476470. The cubic root of 63491761 is about 398.9383535097.

The spelling of 63491761 in words is "sixty-three million, four hundred ninety-one thousand, seven hundred sixty-one".