1001406025 has 9 divisors (see below), whose sum is σ = 1241939701. Its totient is φ = 800998240.

The previous prime is 1001406023. The next prime is 1001406037. The reversal of 1001406025 is 5206041001.

The square root of 1001406025 is 31645.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 18207289 + 983198736 = 4267^2 + 31356^2 .

It is not a de Polignac number, because 1001406025 - 2¹ = 1001406023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001405993 and 1001406011.

It is not an unprimeable number, because it can be changed into a prime (1001406023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 155061 + ... + 161389.

Almost surely, 2^1001406025 is an apocalyptic number.

1001406025 is the 31645-th square number.

1001406025 is the 15823-rd centered octagonal number.

It is an amenable number.

1001406025 is a deficient number, since it is larger than the sum of its proper divisors (240533676).

1001406025 is an frugal number, since it uses more digits than its factorization.

1001406025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12668 (or 6334 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The cubic root of 1001406025 is about 1000.4684555152.

Adding to 1001406025 its reverse (5206041001), we get a palindrome (6207447026).

The spelling of 1001406025 in words is "one billion, one million, four hundred six thousand, twenty-five".