51191983 has 2 divisors, whose sum is σ = 51191984. Its totient is φ = 51191982.

The previous prime is 51191971. The next prime is 51192007. The reversal of 51191983 is 38919115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51191983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51191963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25595991 + 25595992.

It is an arithmetic number, because the mean of its divisors is an integer number (25595992).

Almost surely, 2^51191983 is an apocalyptic number.

51191983 is a deficient number, since it is larger than the sum of its proper divisors (1).

51191983 is an equidigital number, since it uses as much as digits as its factorization.

51191983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 37.

The square root of 51191983 is about 7154.8573011626. The cubic root of 51191983 is about 371.3077246265.

The spelling of 51191983 in words is "fifty-one million, one hundred ninety-one thousand, nine hundred eighty-three".