1981962167 has 4 divisors (see below), whose sum is σ = 2050305720. Its totient is φ = 1913618616.

The previous prime is 1981962139. The next prime is 1981962173. The reversal of 1981962167 is 7612691891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1981962167 - 2¹² = 1981958071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981962107) 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, 34171733 + ... + 34171790.

It is an arithmetic number, because the mean of its divisors is an integer number (512576430).

Almost surely, 2^1981962167 is an apocalyptic number.

1981962167 is a deficient number, since it is larger than the sum of its proper divisors (68343553).

1981962167 is an equidigital number, since it uses as much as digits as its factorization.

1981962167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68343552.

The product of its digits is 326592, while the sum is 50.

The square root of 1981962167 is about 44519.2336748961. The cubic root of 1981962167 is about 1256.1218979068.

The spelling of 1981962167 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-two thousand, one hundred sixty-seven".