1375975921 has 2 divisors, whose sum is σ = 1375975922. Its totient is φ = 1375975920.

The previous prime is 1375975919. The next prime is 1375975961. The reversal of 1375975921 is 1295795731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982509025 + 393466896 = 31345^2 + 19836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375975921 - 2¹ = 1375975919 is a prime.

Together with 1375975919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1375975961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687987960 + 687987961.

It is an arithmetic number, because the mean of its divisors is an integer number (687987961).

Almost surely, 2^1375975921 is an apocalyptic number.

It is an amenable number.

1375975921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375975921 is an equidigital number, since it uses as much as digits as its factorization.

1375975921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 595350, while the sum is 49.

The square root of 1375975921 is about 37094.1494173947. The cubic root of 1375975921 is about 1112.2530653551.

The spelling of 1375975921 in words is "one billion, three hundred seventy-five million, nine hundred seventy-five thousand, nine hundred twenty-one".