981138025 has 72 divisors (see below), whose sum is σ = 1496154240. Its totient is φ = 635120640.

The previous prime is 981138023. The next prime is 981138029. The reversal of 981138025 is 520831189.

It is not a de Polignac number, because 981138025 - 2¹ = 981138023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981138023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2732796 + ... + 2733154.

It is an arithmetic number, because the mean of its divisors is an integer number (20779920).

Almost surely, 2^981138025 is an apocalyptic number.

It is an amenable number.

981138025 is a deficient number, since it is larger than the sum of its proper divisors (515016215).

981138025 is a wasteful number, since it uses less digits than its factorization.

981138025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 981138025 is about 31323.1228487838. The cubic root of 981138025 is about 993.6727250277.

The spelling of 981138025 in words is "nine hundred eighty-one million, one hundred thirty-eight thousand, twenty-five".