1921280025 has 48 divisors (see below), whose sum is σ = 3747442688. Its totient is φ = 849960000.

The previous prime is 1921279937. The next prime is 1921280027. The reversal of 1921280025 is 5200821291.

It is not a de Polignac number, because 1921280025 - 2⁷ = 1921279897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921279974 and 1921280001.

It is not an unprimeable number, because it can be changed into a prime (1921280027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42751 + ... + 75300.

Almost surely, 2^1921280025 is an apocalyptic number.

1921280025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921280025 is a deficient number, since it is larger than the sum of its proper divisors (1826162663).

1921280025 is a wasteful number, since it uses less digits than its factorization.

1921280025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118102 (or 118097 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1921280025 is about 43832.4083869458. The cubic root of 1921280025 is about 1243.1691448639.

The spelling of 1921280025 in words is "one billion, nine hundred twenty-one million, two hundred eighty thousand, twenty-five".