1155420001 has 16 divisors (see below), whose sum is σ = 1260000000. Its totient is φ = 1055327616.

The previous prime is 1155419999. The next prime is 1155420023. The reversal of 1155420001 is 1000245511.

It is a cyclic number.

It is not a de Polignac number, because 1155420001 - 2¹ = 1155419999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155420031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577000 + ... + 578998.

It is an arithmetic number, because the mean of its divisors is an integer number (78750000).

Almost surely, 2^1155420001 is an apocalyptic number.

It is an amenable number.

1155420001 is a deficient number, since it is larger than the sum of its proper divisors (104579999).

1155420001 is a wasteful number, since it uses less digits than its factorization.

1155420001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1155420001 is about 33991.4695328107. The cubic root of 1155420001 is about 1049.3329099072.

Adding to 1155420001 its reverse (1000245511), we get a palindrome (2155665512).

The spelling of 1155420001 in words is "one billion, one hundred fifty-five million, four hundred twenty thousand, one".