51655501 has 2 divisors, whose sum is σ = 51655502. Its totient is φ = 51655500.

The previous prime is 51655489. The next prime is 51655519. The reversal of 51655501 is 10555615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51466276 + 189225 = 7174^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 51655501 - 2⁹ = 51654989 is a prime.

It is a super-2 number, since 2×51655501² = 5336581567122002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51655501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51655561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25827750 + 25827751.

It is an arithmetic number, because the mean of its divisors is an integer number (25827751).

Almost surely, 2^51655501 is an apocalyptic number.

It is an amenable number.

51655501 is a deficient number, since it is larger than the sum of its proper divisors (1).

51655501 is an equidigital number, since it uses as much as digits as its factorization.

51655501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51655501 is about 7187.1761492258. The cubic root of 51655501 is about 372.4250282281.

The spelling of 51655501 in words is "fifty-one million, six hundred fifty-five thousand, five hundred one".