51145553 has 2 divisors, whose sum is σ = 51145554. Its totient is φ = 51145552.

The previous prime is 51145519. The next prime is 51145561. The reversal of 51145553 is 35554115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27164944 + 23980609 = 5212^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 51145553 - 2²² = 46951249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51145453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25572776 + 25572777.

It is an arithmetic number, because the mean of its divisors is an integer number (25572777).

Almost surely, 2^51145553 is an apocalyptic number.

It is an amenable number.

51145553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51145553 is an equidigital number, since it uses as much as digits as its factorization.

51145553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 29.

The square root of 51145553 is about 7151.6119162046. The cubic root of 51145553 is about 371.1954346980.

Adding to 51145553 its reverse (35554115), we get a palindrome (86699668).

It can be divided in two parts, 511 and 45553, that added together give a palindrome (46064).

The spelling of 51145553 in words is "fifty-one million, one hundred forty-five thousand, five hundred fifty-three".