51415993 has 2 divisors, whose sum is σ = 51415994. Its totient is φ = 51415992.

The previous prime is 51415981. The next prime is 51416023. The reversal of 51415993 is 39951415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44462224 + 6953769 = 6668^2 + 2637^2 .

It is a cyclic number.

It is not a de Polignac number, because 51415993 - 2²⁵ = 17861561 is a prime.

It is not a weakly prime, because it can be changed into another prime (51415913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25707996 + 25707997.

It is an arithmetic number, because the mean of its divisors is an integer number (25707997).

Almost surely, 2^51415993 is an apocalyptic number.

It is an amenable number.

51415993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51415993 is an equidigital number, since it uses as much as digits as its factorization.

51415993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 37.

The square root of 51415993 is about 7170.4946133443. The cubic root of 51415993 is about 371.8485359601.

The spelling of 51415993 in words is "fifty-one million, four hundred fifteen thousand, nine hundred ninety-three".