1972164881 has 4 divisors (see below), whose sum is σ = 1983564852. Its totient is φ = 1960764912.

The previous prime is 1972164853. The next prime is 1972164889. The reversal of 1972164881 is 1884612791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1884612791 = 31 ⋅60793961.

It can be written as a sum of positive squares in 2 ways, for example, as 1179235600 + 792929281 = 34340^2 + 28159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972164881 - 2²² = 1967970577 is a prime.

It is a super-2 number, since 2×1972164881² = 7778868635699488322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972164889) 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, 5699726 + ... + 5700071.

It is an arithmetic number, because the mean of its divisors is an integer number (495891213).

Almost surely, 2^1972164881 is an apocalyptic number.

It is an amenable number.

1972164881 is a deficient number, since it is larger than the sum of its proper divisors (11399971).

1972164881 is a wasteful number, since it uses less digits than its factorization.

1972164881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11399970.

The product of its digits is 193536, while the sum is 47.

The square root of 1972164881 is about 44409.0630502378. The cubic root of 1972164881 is about 1254.0487134572.

The spelling of 1972164881 in words is "one billion, nine hundred seventy-two million, one hundred sixty-four thousand, eight hundred eighty-one".