1961871101 has 2 divisors, whose sum is σ = 1961871102. Its totient is φ = 1961871100.

The previous prime is 1961871073. The next prime is 1961871103. The reversal of 1961871101 is 1011781691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1697028025 + 264843076 = 41195^2 + 16274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961871101 is a prime.

Together with 1961871103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961871103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980935550 + 980935551.

It is an arithmetic number, because the mean of its divisors is an integer number (980935551).

Almost surely, 2^1961871101 is an apocalyptic number.

It is an amenable number.

1961871101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961871101 is an equidigital number, since it uses as much as digits as its factorization.

1961871101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 35.

The square root of 1961871101 is about 44293.0141331565. The cubic root of 1961871101 is about 1251.8630567162.

The spelling of 1961871101 in words is "one billion, nine hundred sixty-one million, eight hundred seventy-one thousand, one hundred one".