61978349 has 2 divisors, whose sum is σ = 61978350. Its totient is φ = 61978348.

The previous prime is 61978333. The next prime is 61978363. The reversal of 61978349 is 94387916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43428100 + 18550249 = 6590^2 + 4307^2 .

It is a cyclic number.

It is not a de Polignac number, because 61978349 - 2⁴ = 61978333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61978649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989174 + 30989175.

It is an arithmetic number, because the mean of its divisors is an integer number (30989175).

Almost surely, 2^61978349 is an apocalyptic number.

It is an amenable number.

61978349 is a deficient number, since it is larger than the sum of its proper divisors (1).

61978349 is an equidigital number, since it uses as much as digits as its factorization.

61978349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 61978349 is about 7872.6329140892. The cubic root of 61978349 is about 395.7430844691.

The spelling of 61978349 in words is "sixty-one million, nine hundred seventy-eight thousand, three hundred forty-nine".