51540023 has 2 divisors, whose sum is σ = 51540024. Its totient is φ = 51540022.

The previous prime is 51539977. The next prime is 51540031. The reversal of 51540023 is 32004515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51540023 - 2⁶ = 51539959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51539977 and 51540004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51540043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25770011 + 25770012.

It is an arithmetic number, because the mean of its divisors is an integer number (25770012).

Almost surely, 2^51540023 is an apocalyptic number.

51540023 is a deficient number, since it is larger than the sum of its proper divisors (1).

51540023 is an equidigital number, since it uses as much as digits as its factorization.

51540023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51540023 is about 7179.1380401828. The cubic root of 51540023 is about 372.1472973357.

Adding to 51540023 its reverse (32004515), we get a palindrome (83544538).

The spelling of 51540023 in words is "fifty-one million, five hundred forty thousand, twenty-three".