61551263 has 2 divisors, whose sum is σ = 61551264. Its totient is φ = 61551262.

The previous prime is 61551233. The next prime is 61551283. The reversal of 61551263 is 36215516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61551263 - 2¹⁶ = 61485727 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61551233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775631 + 30775632.

It is an arithmetic number, because the mean of its divisors is an integer number (30775632).

Almost surely, 2^61551263 is an apocalyptic number.

61551263 is a deficient number, since it is larger than the sum of its proper divisors (1).

61551263 is an equidigital number, since it uses as much as digits as its factorization.

61551263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 61551263 is about 7845.4612993756. The cubic root of 61551263 is about 394.8319810966.

Adding to 61551263 its reverse (36215516), we get a palindrome (97766779).

The spelling of 61551263 in words is "sixty-one million, five hundred fifty-one thousand, two hundred sixty-three".