1975887121 has 8 divisors (see below), whose sum is σ = 2239872320. Its totient is φ = 1727901072.

The previous prime is 1975887113. The next prime is 1975887143. The reversal of 1975887121 is 1217885791.

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 1975887121 - 2³ = 1975887113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1975884121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3999525 + ... + 4000018.

It is an arithmetic number, because the mean of its divisors is an integer number (279984040).

Almost surely, 2^1975887121 is an apocalyptic number.

It is an amenable number.

1975887121 is a deficient number, since it is larger than the sum of its proper divisors (263985199).

1975887121 is a wasteful number, since it uses less digits than its factorization.

1975887121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7999575.

The product of its digits is 282240, while the sum is 49.

The square root of 1975887121 is about 44450.9518570750. The cubic root of 1975887121 is about 1254.8371763810.

The spelling of 1975887121 in words is "one billion, nine hundred seventy-five million, eight hundred eighty-seven thousand, one hundred twenty-one".