1981662195 has 8 divisors (see below), whose sum is σ = 3170659536. Its totient is φ = 1056886496.

The previous prime is 1981662173. The next prime is 1981662211. The reversal of 1981662195 is 5912661891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981662195 - 2⁹ = 1981661683 is a prime.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 66055392 + ... + 66055421.

It is an arithmetic number, because the mean of its divisors is an integer number (396332442).

Almost surely, 2^1981662195 is an apocalyptic number.

1981662195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981662195 is a deficient number, since it is larger than the sum of its proper divisors (1188997341).

1981662195 is a wasteful number, since it uses less digits than its factorization.

1981662195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132110821.

The product of its digits is 233280, while the sum is 48.

The square root of 1981662195 is about 44515.8645316476. The cubic root of 1981662195 is about 1256.0585229317.

The spelling of 1981662195 in words is "one billion, nine hundred eighty-one million, six hundred sixty-two thousand, one hundred ninety-five".