53621779 has 2 divisors, whose sum is σ = 53621780. Its totient is φ = 53621778.

The previous prime is 53621767. The next prime is 53621797. The reversal of 53621779 is 97712635.

Together with next prime (53621797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53621779 - 2⁵ = 53621747 is a prime.

It is not a weakly prime, because it can be changed into another prime (53621719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26810889 + 26810890.

It is an arithmetic number, because the mean of its divisors is an integer number (26810890).

Almost surely, 2^53621779 is an apocalyptic number.

53621779 is a deficient number, since it is larger than the sum of its proper divisors (1).

53621779 is an equidigital number, since it uses as much as digits as its factorization.

53621779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 53621779 is about 7322.6893283820. The cubic root of 53621779 is about 377.0917862666.

The spelling of 53621779 in words is "fifty-three million, six hundred twenty-one thousand, seven hundred seventy-nine".