1001020172 has 12 divisors (see below), whose sum is σ = 1772891736. Its totient is φ = 494479680.

The previous prime is 1001020171. The next prime is 1001020213. The reversal of 1001020172 is 2710201001.

It is not an unprimeable number, because it can be changed into a prime (1001020171) 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, 1507229 + ... + 1507892.

It is an arithmetic number, because the mean of its divisors is an integer number (147740978).

Almost surely, 2^1001020172 is an apocalyptic number.

It is an amenable number.

1001020172 is a deficient number, since it is larger than the sum of its proper divisors (771871564).

1001020172 is a wasteful number, since it uses less digits than its factorization.

1001020172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015208 (or 3015206 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1001020172 is about 31638.9028254774. The cubic root of 1001020172 is about 1000.3399417598.

Adding to 1001020172 its reverse (2710201001), we get a palindrome (3711221173).

The spelling of 1001020172 in words is "one billion, one million, twenty thousand, one hundred seventy-two".