61920553 has 2 divisors, whose sum is σ = 61920554. Its totient is φ = 61920552.

The previous prime is 61920541. The next prime is 61920557. The reversal of 61920553 is 35502916.

61920553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61905424 + 15129 = 7868^2 + 123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61920553 is a prime.

It is not a weakly prime, because it can be changed into another prime (61920557) 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 as a sum of consecutive naturals, namely, 30960276 + 30960277.

It is an arithmetic number, because the mean of its divisors is an integer number (30960277).

Almost surely, 2^61920553 is an apocalyptic number.

It is an amenable number.

61920553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61920553 is an equidigital number, since it uses as much as digits as its factorization.

61920553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 61920553 is about 7868.9613672962. The cubic root of 61920553 is about 395.6200335381.

The spelling of 61920553 in words is "sixty-one million, nine hundred twenty thousand, five hundred fifty-three".