1055111201531 has 4 divisors (see below), whose sum is σ = 1055311303752. Its totient is φ = 1054911099312.

The previous prime is 1055111201513. The next prime is 1055111201561. The reversal of 1055111201531 is 1351021115501.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055111201531 is a prime.

It is a super-2 number, since 2×1055111201531² (a number of 25 digits) contains 22 as substring.

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 1055111201531.

It is not an unprimeable number, because it can be changed into a prime (1055111201561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100043201 + ... + 100053746.

It is an arithmetic number, because the mean of its divisors is an integer number (263827825938).

Almost surely, 2^{1055111201531} is an apocalyptic number.

1055111201531 is a deficient number, since it is larger than the sum of its proper divisors (200102221).

1055111201531 is an equidigital number, since it uses as much as digits as its factorization.

1055111201531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200102220.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 1055111201531 in words is "one trillion, fifty-five billion, one hundred eleven million, two hundred one thousand, five hundred thirty-one".