61815263 has 2 divisors, whose sum is σ = 61815264. Its totient is φ = 61815262.

The previous prime is 61815253. The next prime is 61815277. The reversal of 61815263 is 36251816.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61815263 - 2¹⁸ = 61553119 is a prime.

It is a super-2 number, since 2×61815263² = 7642253479518338, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61815253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30907631 + 30907632.

It is an arithmetic number, because the mean of its divisors is an integer number (30907632).

Almost surely, 2^61815263 is an apocalyptic number.

61815263 is a deficient number, since it is larger than the sum of its proper divisors (1).

61815263 is an equidigital number, since it uses as much as digits as its factorization.

61815263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 61815263 is about 7862.2683113717. The cubic root of 61815263 is about 395.3956682632.

The spelling of 61815263 in words is "sixty-one million, eight hundred fifteen thousand, two hundred sixty-three".