1613121012 has 18 divisors (see below), whose sum is σ = 4077611538. Its totient is φ = 537706992.

The previous prime is 1613121001. The next prime is 1613121017. The reversal of 1613121012 is 2101213161.

It can be written as a sum of positive squares in only one way, i.e., 1390096656 + 223024356 = 37284^2 + 14934^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613121017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22404423 + ... + 22404494.

Almost surely, 2^1613121012 is an apocalyptic number.

1613121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1613121012 is an abundant number, since it is smaller than the sum of its proper divisors (2464490526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1613121012 is a wasteful number, since it uses less digits than its factorization.

1613121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44808927 (or 44808922 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1613121012 is about 40163.6777698457. The cubic root of 1613121012 is about 1172.7955679256.

Adding to 1613121012 its reverse (2101213161), we get a palindrome (3714334173).

The spelling of 1613121012 in words is "one billion, six hundred thirteen million, one hundred twenty-one thousand, twelve".