51897427 has 2 divisors, whose sum is σ = 51897428. Its totient is φ = 51897426.

The previous prime is 51897383. The next prime is 51897437. The reversal of 51897427 is 72479815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51897427 - 2⁷ = 51897299 is a prime.

It is not a weakly prime, because it can be changed into another prime (51897437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25948713 + 25948714.

It is an arithmetic number, because the mean of its divisors is an integer number (25948714).

Almost surely, 2^51897427 is an apocalyptic number.

51897427 is a deficient number, since it is larger than the sum of its proper divisors (1).

51897427 is an equidigital number, since it uses as much as digits as its factorization.

51897427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 51897427 is about 7203.9868822757. The cubic root of 51897427 is about 373.0055343500.

The spelling of 51897427 in words is "fifty-one million, eight hundred ninety-seven thousand, four hundred twenty-seven".