1921755425 has 12 divisors (see below), whose sum is σ = 2388418560. Its totient is φ = 1533893520.

The previous prime is 1921755419. The next prime is 1921755431. The reversal of 1921755425 is 5245571291.

It is an interprime number because it is at equal distance from previous prime (1921755419) and next prime (1921755431).

It is not a de Polignac number, because 1921755425 - 2⁸ = 1921755169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76577 + ... + 98526.

It is an arithmetic number, because the mean of its divisors is an integer number (199034880).

Almost surely, 2^1921755425 is an apocalyptic number.

It is an amenable number.

1921755425 is a deficient number, since it is larger than the sum of its proper divisors (466663135).

1921755425 is a wasteful number, since it uses less digits than its factorization.

1921755425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175552 (or 175547 counting only the distinct ones).

The product of its digits is 126000, while the sum is 41.

The square root of 1921755425 is about 43837.8309796459. The cubic root of 1921755425 is about 1243.2716726691.

The spelling of 1921755425 in words is "one billion, nine hundred twenty-one million, seven hundred fifty-five thousand, four hundred twenty-five".