1961981347 has 2 divisors, whose sum is σ = 1961981348. Its totient is φ = 1961981346.

The previous prime is 1961981321. The next prime is 1961981377. The reversal of 1961981347 is 7431891691.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961981347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1961981347.

It is not a weakly prime, because it can be changed into another prime (1961981317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980990673 + 980990674.

It is an arithmetic number, because the mean of its divisors is an integer number (980990674).

Almost surely, 2^1961981347 is an apocalyptic number.

1961981347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961981347 is an equidigital number, since it uses as much as digits as its factorization.

1961981347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 1961981347 is about 44294.2586234379. The cubic root of 1961981347 is about 1251.8865054721.

The spelling of 1961981347 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-one thousand, three hundred forty-seven".