1025145421 has 8 divisors (see below), whose sum is σ = 1054717664. Its totient is φ = 995671440.

The previous prime is 1025145377. The next prime is 1025145439. The reversal of 1025145421 is 1245415201.

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 1025145421 - 2²¹ = 1023048269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025145461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3135 + ... + 45388.

It is an arithmetic number, because the mean of its divisors is an integer number (131839708).

Almost surely, 2^1025145421 is an apocalyptic number.

It is an amenable number.

1025145421 is a deficient number, since it is larger than the sum of its proper divisors (29572243).

1025145421 is an equidigital number, since it uses as much as digits as its factorization.

1025145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49131.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1025145421 is about 32017.8922010803. The cubic root of 1025145421 is about 1008.3125175920.

The spelling of 1025145421 in words is "one billion, twenty-five million, one hundred forty-five thousand, four hundred twenty-one".