1155572001 has 40 divisors (see below), whose sum is σ = 1821543680. Its totient is φ = 728043552.

The previous prime is 1155571997. The next prime is 1155572009. The reversal of 1155572001 is 1002755511.

It is not a de Polignac number, because 1155572001 - 2² = 1155571997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1155572009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 933555 + ... + 934791.

It is an arithmetic number, because the mean of its divisors is an integer number (45538592).

Almost surely, 2^1155572001 is an apocalyptic number.

It is an amenable number.

1155572001 is a deficient number, since it is larger than the sum of its proper divisors (665971679).

1155572001 is a wasteful number, since it uses less digits than its factorization.

1155572001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1866 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 27.

The square root of 1155572001 is about 33993.7053143667. The cubic root of 1155572001 is about 1049.3789224995.

The spelling of 1155572001 in words is "one billion, one hundred fifty-five million, five hundred seventy-two thousand, one".