1961871107 has 4 divisors (see below), whose sum is σ = 2242138416. Its totient is φ = 1681603800.

The previous prime is 1961871103. The next prime is 1961871137. The reversal of 1961871107 is 7011781691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7011781691 = 2339 ⋅2997769.

It is a cyclic number.

It is not a de Polignac number, because 1961871107 - 2² = 1961871103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961871101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140133644 + ... + 140133657.

It is an arithmetic number, because the mean of its divisors is an integer number (560534604).

Almost surely, 2^1961871107 is an apocalyptic number.

1961871107 is a deficient number, since it is larger than the sum of its proper divisors (280267309).

1961871107 is an equidigital number, since it uses as much as digits as its factorization.

1961871107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280267308.

The product of its (nonzero) digits is 21168, while the sum is 41.

The square root of 1961871107 is about 44293.0142008873. The cubic root of 1961871107 is about 1251.8630579924.

The spelling of 1961871107 in words is "one billion, nine hundred sixty-one million, eight hundred seventy-one thousand, one hundred seven".