61945649 has 2 divisors, whose sum is σ = 61945650. Its totient is φ = 61945648.

The previous prime is 61945633. The next prime is 61945661. The reversal of 61945649 is 94654916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 5094049 = 7540^2 + 2257^2 .

It is a cyclic number.

It is not a de Polignac number, because 61945649 - 2⁴ = 61945633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61945619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30972824 + 30972825.

It is an arithmetic number, because the mean of its divisors is an integer number (30972825).

Almost surely, 2^61945649 is an apocalyptic number.

It is an amenable number.

61945649 is a deficient number, since it is larger than the sum of its proper divisors (1).

61945649 is an equidigital number, since it uses as much as digits as its factorization.

61945649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 61945649 is about 7870.5558253531. Note that the first 3 decimals coincide. The cubic root of 61945649 is about 395.6734737335.

The spelling of 61945649 in words is "sixty-one million, nine hundred forty-five thousand, six hundred forty-nine".