61945549 has 2 divisors, whose sum is σ = 61945550. Its totient is φ = 61945548.

The previous prime is 61945531. The next prime is 61945619. The reversal of 61945549 is 94554916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 8649 = 7870^2 + 93^2 .

It is a cyclic number.

It is not a de Polignac number, because 61945549 - 2²³ = 53556941 is a prime.

It is a super-2 number, since 2×61945549² = 7674502081822802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61945649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30972774 + 30972775.

It is an arithmetic number, because the mean of its divisors is an integer number (30972775).

Almost surely, 2^61945549 is an apocalyptic number.

It is an amenable number.

61945549 is a deficient number, since it is larger than the sum of its proper divisors (1).

61945549 is an equidigital number, since it uses as much as digits as its factorization.

61945549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 61945549 is about 7870.5494725591. The cubic root of 61945549 is about 395.6732608190.

The spelling of 61945549 in words is "sixty-one million, nine hundred forty-five thousand, five hundred forty-nine".