1009925281 has 4 divisors (see below), whose sum is σ = 1009990192. Its totient is φ = 1009860372.

The previous prime is 1009925269. The next prime is 1009925291. The reversal of 1009925281 is 1825299001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1825299001 = 28069 ⋅65029.

It is a cyclic number.

It is not a de Polignac number, because 1009925281 - 2²⁵ = 976370849 is a prime.

It is a super-2 number, since 2×1009925281² = 2039898146405857922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1009925281.

It is not an unprimeable number, because it can be changed into a prime (1009925251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6346 + ... + 45388.

It is an arithmetic number, because the mean of its divisors is an integer number (252497548).

Almost surely, 2^1009925281 is an apocalyptic number.

It is an amenable number.

1009925281 is a deficient number, since it is larger than the sum of its proper divisors (64911).

1009925281 is an equidigital number, since it uses as much as digits as its factorization.

1009925281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64910.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1009925281 is about 31779.3215943953. The cubic root of 1009925281 is about 1003.2975412693.

The spelling of 1009925281 in words is "one billion, nine million, nine hundred twenty-five thousand, two hundred eighty-one".