1001420155 has 4 divisors (see below), whose sum is σ = 1201704192. Its totient is φ = 801136120.

The previous prime is 1001420129. The next prime is 1001420159. The reversal of 1001420155 is 5510241001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1001420155 - 2¹¹ = 1001418107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001420159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100142011 + ... + 100142020.

It is an arithmetic number, because the mean of its divisors is an integer number (300426048).

Almost surely, 2^1001420155 is an apocalyptic number.

1001420155 is a deficient number, since it is larger than the sum of its proper divisors (200284037).

1001420155 is an equidigital number, since it uses as much as digits as its factorization.

1001420155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200284036.

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

The square root of 1001420155 is about 31645.2232572311. The cubic root of 1001420155 is about 1000.4731610833.

Adding to 1001420155 its reverse (5510241001), we get a palindrome (6511661156).

The spelling of 1001420155 in words is "one billion, one million, four hundred twenty thousand, one hundred fifty-five".