61978963 has 2 divisors, whose sum is σ = 61978964. Its totient is φ = 61978962.

The previous prime is 61978933. The next prime is 61979009. The reversal of 61978963 is 36987916.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61978963 is a prime.

It is not a weakly prime, because it can be changed into another prime (61978913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989481 + 30989482.

It is an arithmetic number, because the mean of its divisors is an integer number (30989482).

Almost surely, 2^61978963 is an apocalyptic number.

61978963 is a deficient number, since it is larger than the sum of its proper divisors (1).

61978963 is an equidigital number, since it uses as much as digits as its factorization.

61978963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 61978963 is about 7872.6719098410. The cubic root of 61978963 is about 395.7443912988.

The spelling of 61978963 in words is "sixty-one million, nine hundred seventy-eight thousand, nine hundred sixty-three".