51930491 has 2 divisors, whose sum is σ = 51930492. Its totient is φ = 51930490.

The previous prime is 51930479. The next prime is 51930511. The reversal of 51930491 is 19403915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51930491 - 2¹⁸ = 51668347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51930421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25965245 + 25965246.

It is an arithmetic number, because the mean of its divisors is an integer number (25965246).

Almost surely, 2^51930491 is an apocalyptic number.

51930491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51930491 is an equidigital number, since it uses as much as digits as its factorization.

51930491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 51930491 is about 7206.2813572605. The cubic root of 51930491 is about 373.0847318329.

The spelling of 51930491 in words is "fifty-one million, nine hundred thirty thousand, four hundred ninety-one".