51305949 has 24 divisors (see below), whose sum is σ = 79589952. Its totient is φ = 31731840.

The previous prime is 51305929. The next prime is 51305951. The reversal of 51305949 is 94950315.

It is not a de Polignac number, because 51305949 - 2⁸ = 51305693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8502 + ... + 13224.

It is an arithmetic number, because the mean of its divisors is an integer number (3316248).

Almost surely, 2^51305949 is an apocalyptic number.

It is an amenable number.

51305949 is a deficient number, since it is larger than the sum of its proper divisors (28284003).

51305949 is a wasteful number, since it uses less digits than its factorization.

51305949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817 (or 4814 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 51305949 is about 7162.8171133989. The cubic root of 51305949 is about 371.5830613111.

The spelling of 51305949 in words is "fifty-one million, three hundred five thousand, nine hundred forty-nine".