918021725 has 6 divisors (see below), whose sum is σ = 1138346970. Its totient is φ = 734417360.

The previous prime is 918021703. The next prime is 918021781. The reversal of 918021725 is 527120819.

It can be written as a sum of positive squares in 3 ways, for example, as 128074489 + 789947236 = 11317^2 + 28106^2 .

It is not a de Polignac number, because 918021725 - 2¹⁶ = 917956189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18360410 + ... + 18360459.

It is an arithmetic number, because the mean of its divisors is an integer number (189724495).

Almost surely, 2^918021725 is an apocalyptic number.

It is an amenable number.

918021725 is a deficient number, since it is larger than the sum of its proper divisors (220325245).

918021725 is a wasteful number, since it uses less digits than its factorization.

918021725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36720879 (or 36720874 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 918021725 is about 30298.8733288880. The cubic root of 918021725 is about 971.8912070511.

The spelling of 918021725 in words is "nine hundred eighteen million, twenty-one thousand, seven hundred twenty-five".