2155513331 has 4 divisors (see below), whose sum is σ = 2205641592. Its totient is φ = 2105385072.

The previous prime is 2155513303. The next prime is 2155513337. The reversal of 2155513331 is 1333155512.

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-2155513331 is a prime.

It is a super-2 number, since 2×2155513331² = 9292475440237431122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2155513294 and 2155513303.

It is not an unprimeable number, because it can be changed into a prime (2155513337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25064066 + ... + 25064151.

It is an arithmetic number, because the mean of its divisors is an integer number (551410398).

Almost surely, 2^2155513331 is an apocalyptic number.

2155513331 is a deficient number, since it is larger than the sum of its proper divisors (50128261).

2155513331 is an equidigital number, since it uses as much as digits as its factorization.

2155513331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50128260.

The product of its digits is 6750, while the sum is 29.

The square root of 2155513331 is about 46427.5061897578. The cubic root of 2155513331 is about 1291.7651718110.

Adding to 2155513331 its reverse (1333155512), we get a palindrome (3488668843).

The spelling of 2155513331 in words is "two billion, one hundred fifty-five million, five hundred thirteen thousand, three hundred thirty-one".