61279553 has 2 divisors, whose sum is σ = 61279554. Its totient is φ = 61279552.

The previous prime is 61279531. The next prime is 61279609. The reversal of 61279553 is 35597216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 1495729 = 7732^2 + 1223^2 .

It is a cyclic number.

It is not a de Polignac number, because 61279553 - 2⁶ = 61279489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61272553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30639776 + 30639777.

It is an arithmetic number, because the mean of its divisors is an integer number (30639777).

Almost surely, 2^61279553 is an apocalyptic number.

It is an amenable number.

61279553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61279553 is an equidigital number, since it uses as much as digits as its factorization.

61279553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 61279553 is about 7828.1257654690. The cubic root of 61279553 is about 394.2501460636.

The spelling of 61279553 in words is "sixty-one million, two hundred seventy-nine thousand, five hundred fifty-three".