51721755 has 8 divisors (see below), whose sum is σ = 82754832. Its totient is φ = 27584928.

The previous prime is 51721753. The next prime is 51721757. The reversal of 51721755 is 55712715.

51721755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51721753) and next prime (51721757).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51721755 - 2¹ = 51721753 is a prime.

It is a super-3 number, since 3×51721755³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51721753) 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 7 ways as a sum of consecutive naturals, for example, 1724044 + ... + 1724073.

It is an arithmetic number, because the mean of its divisors is an integer number (10344354).

Almost surely, 2^51721755 is an apocalyptic number.

51721755 is a deficient number, since it is larger than the sum of its proper divisors (31033077).

51721755 is a wasteful number, since it uses less digits than its factorization.

51721755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448125.

The product of its digits is 12250, while the sum is 33.

The square root of 51721755 is about 7191.7838538154. The cubic root of 51721755 is about 372.5841858880.

The spelling of 51721755 in words is "fifty-one million, seven hundred twenty-one thousand, seven hundred fifty-five".