51491501 has 16 divisors (see below), whose sum is σ = 56635200. Its totient is φ = 46626048.

The previous prime is 51491497. The next prime is 51491507. The reversal of 51491501 is 10519415.

51491501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51491501 - 2² = 51491497 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61850 + ... + 62676.

It is an arithmetic number, because the mean of its divisors is an integer number (3539700).

Almost surely, 2^51491501 is an apocalyptic number.

It is an amenable number.

51491501 is a deficient number, since it is larger than the sum of its proper divisors (5143699).

51491501 is a wasteful number, since it uses less digits than its factorization.

51491501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 51491501 is about 7175.7578693822. The cubic root of 51491501 is about 372.0304754969.

The spelling of 51491501 in words is "fifty-one million, four hundred ninety-one thousand, five hundred one".