1011401555 has 4 divisors (see below), whose sum is σ = 1213681872. Its totient is φ = 809121240.

The previous prime is 1011401543. The next prime is 1011401561. The reversal of 1011401555 is 5551041101.

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

It is not a de Polignac number, because 1011401555 - 2¹⁰ = 1011400531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011401555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101140151 + ... + 101140160.

It is an arithmetic number, because the mean of its divisors is an integer number (303420468).

Almost surely, 2^1011401555 is an apocalyptic number.

1011401555 is a deficient number, since it is larger than the sum of its proper divisors (202280317).

1011401555 is an equidigital number, since it uses as much as digits as its factorization.

1011401555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202280316.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1011401555 is about 31802.5400715100. The cubic root of 1011401555 is about 1003.7861651948.

Adding to 1011401555 its reverse (5551041101), we get a palindrome (6562442656).

The spelling of 1011401555 in words is "one billion, eleven million, four hundred one thousand, five hundred fifty-five".