61221473 has 2 divisors, whose sum is σ = 61221474. Its totient is φ = 61221472.

The previous prime is 61221467. The next prime is 61221521. The reversal of 61221473 is 37412216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45792289 + 15429184 = 6767^2 + 3928^2 .

It is a cyclic number.

It is not a de Polignac number, because 61221473 - 2²² = 57027169 is a prime.

It is not a weakly prime, because it can be changed into another prime (61221443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610736 + 30610737.

It is an arithmetic number, because the mean of its divisors is an integer number (30610737).

Almost surely, 2^61221473 is an apocalyptic number.

It is an amenable number.

61221473 is a deficient number, since it is larger than the sum of its proper divisors (1).

61221473 is an equidigital number, since it uses as much as digits as its factorization.

61221473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 61221473 is about 7824.4151858142. The cubic root of 61221473 is about 394.1255515600.

Adding to 61221473 its reverse (37412216), we get a palindrome (98633689).

The spelling of 61221473 in words is "sixty-one million, two hundred twenty-one thousand, four hundred seventy-three".