61572881 has 2 divisors, whose sum is σ = 61572882. Its totient is φ = 61572880.

The previous prime is 61572877. The next prime is 61572883. The reversal of 61572881 is 18827516.

61572881 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., 61089856 + 483025 = 7816^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 61572881 - 2² = 61572877 is a prime.

It is a super-2 number, since 2×61572881² = 7582439349280322, which contains 22 as substring.

Together with 61572883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61572883) 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, 30786440 + 30786441.

It is an arithmetic number, because the mean of its divisors is an integer number (30786441).

Almost surely, 2^61572881 is an apocalyptic number.

It is an amenable number.

61572881 is a deficient number, since it is larger than the sum of its proper divisors (1).

61572881 is an equidigital number, since it uses as much as digits as its factorization.

61572881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 61572881 is about 7846.8389176789. The cubic root of 61572881 is about 394.8781999082.

The spelling of 61572881 in words is "sixty-one million, five hundred seventy-two thousand, eight hundred eighty-one".