61181563 has 2 divisors, whose sum is σ = 61181564. Its totient is φ = 61181562.

The previous prime is 61181543. The next prime is 61181567. The reversal of 61181563 is 36518116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61181563 - 2⁹ = 61181051 is a prime.

It is a super-2 number, since 2×61181563² = 7486367302245938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61181567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30590781 + 30590782.

It is an arithmetic number, because the mean of its divisors is an integer number (30590782).

Almost surely, 2^61181563 is an apocalyptic number.

61181563 is a deficient number, since it is larger than the sum of its proper divisors (1).

61181563 is an equidigital number, since it uses as much as digits as its factorization.

61181563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 61181563 is about 7821.8644196892. The cubic root of 61181563 is about 394.0398900580.

Adding to 61181563 its reverse (36518116), we get a palindrome (97699679).

It can be divided in two parts, 6 and 1181563, that added together give a square (1181569 = 1087²).

The spelling of 61181563 in words is "sixty-one million, one hundred eighty-one thousand, five hundred sixty-three".