1001645701 has 6 divisors (see below), whose sum is σ = 1165179750. Its totient is φ = 858553416.

The previous prime is 1001645693. The next prime is 1001645737. The reversal of 1001645701 is 1075461001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 951660801 + 49984900 = 30849^2 + 7070^2 .

It is not a de Polignac number, because 1001645701 - 2³ = 1001645693 is a prime.

It is a super-2 number, since 2×1001645701² = 2006588220663562802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001645201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10220826 + ... + 10220923.

It is an arithmetic number, because the mean of its divisors is an integer number (194196625).

Almost surely, 2^1001645701 is an apocalyptic number.

It is an amenable number.

1001645701 is a deficient number, since it is larger than the sum of its proper divisors (163534049).

1001645701 is an equidigital number, since it uses as much as digits as its factorization.

1001645701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20441763 (or 20441756 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1001645701 is about 31648.7867224006. The cubic root of 1001645701 is about 1000.5482663491.

The spelling of 1001645701 in words is "one billion, one million, six hundred forty-five thousand, seven hundred one".