1961859371 has 2 divisors, whose sum is σ = 1961859372. Its totient is φ = 1961859370.

The previous prime is 1961859337. The next prime is 1961859401. The reversal of 1961859371 is 1739581691.

It is a strong prime.

It is an emirp because it is prime and its reverse (1739581691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961859371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961859071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980929685 + 980929686.

It is an arithmetic number, because the mean of its divisors is an integer number (980929686).

Almost surely, 2^1961859371 is an apocalyptic number.

1961859371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961859371 is an equidigital number, since it uses as much as digits as its factorization.

1961859371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 50.

The square root of 1961859371 is about 44292.8817193011. The cubic root of 1961859371 is about 1251.8605617540.

The spelling of 1961859371 in words is "one billion, nine hundred sixty-one million, eight hundred fifty-nine thousand, three hundred seventy-one".