51564503 has 2 divisors, whose sum is σ = 51564504. Its totient is φ = 51564502.

The previous prime is 51564481. The next prime is 51564509. The reversal of 51564503 is 30546515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51564503 - 2²² = 47370199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51564509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25782251 + 25782252.

It is an arithmetic number, because the mean of its divisors is an integer number (25782252).

Almost surely, 2^51564503 is an apocalyptic number.

51564503 is a deficient number, since it is larger than the sum of its proper divisors (1).

51564503 is an equidigital number, since it uses as much as digits as its factorization.

51564503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 51564503 is about 7180.8427778360. The cubic root of 51564503 is about 372.2062076953.

The spelling of 51564503 in words is "fifty-one million, five hundred sixty-four thousand, five hundred three".