51521263 has 2 divisors, whose sum is σ = 51521264. Its totient is φ = 51521262.

The previous prime is 51521209. The next prime is 51521269. The reversal of 51521263 is 36212515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51521263 - 2¹⁷ = 51390191 is a prime.

It is a super-2 number, since 2×51521263² = 5308881082230338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51521269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760631 + 25760632.

It is an arithmetic number, because the mean of its divisors is an integer number (25760632).

Almost surely, 2^51521263 is an apocalyptic number.

51521263 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521263 is an equidigital number, since it uses as much as digits as its factorization.

51521263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 51521263 is about 7177.8313577292. The cubic root of 51521263 is about 372.1021393521.

Adding to 51521263 its reverse (36212515), we get a palindrome (87733778).

The spelling of 51521263 in words is "fifty-one million, five hundred twenty-one thousand, two hundred sixty-three".