1972105449 has 4 divisors (see below), whose sum is σ = 2629473936. Its totient is φ = 1314736964.

The previous prime is 1972105427. The next prime is 1972105463. The reversal of 1972105449 is 9445012791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9445012791 = 3 ⋅3148337597.

It is a cyclic number.

It is not a de Polignac number, because 1972105449 - 2⁷ = 1972105321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1972105449.

It is not an unprimeable number, because it can be changed into a prime (1972105409) 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, 328684239 + ... + 328684244.

It is an arithmetic number, because the mean of its divisors is an integer number (657368484).

Almost surely, 2^1972105449 is an apocalyptic number.

It is an amenable number.

1972105449 is a deficient number, since it is larger than the sum of its proper divisors (657368487).

1972105449 is an equidigital number, since it uses as much as digits as its factorization.

1972105449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657368486.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1972105449 is about 44408.3939025045. The cubic root of 1972105449 is about 1254.0361162394.

The spelling of 1972105449 in words is "one billion, nine hundred seventy-two million, one hundred five thousand, four hundred forty-nine".