37728184121 has 4 divisors (see below), whose sum is σ = 37890107892. Its totient is φ = 37566260352.

The previous prime is 37728184103. The next prime is 37728184139. The reversal of 37728184121 is 12148182773.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (37728184103) and next prime (37728184139).

It can be written as a sum of positive squares in 2 ways, for example, as 18187219600 + 19540964521 = 134860^2 + 139789^2 .

It is a cyclic number.

It is not a de Polignac number, because 37728184121 - 2³⁴ = 20548314937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (37728184171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80961536 + ... + 80962001.

It is an arithmetic number, because the mean of its divisors is an integer number (9472526973).

Almost surely, 2^37728184121 is an apocalyptic number.

It is an amenable number.

37728184121 is a deficient number, since it is larger than the sum of its proper divisors (161923771).

37728184121 is a wasteful number, since it uses less digits than its factorization.

37728184121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161923770.

The product of its digits is 150528, while the sum is 44.

The spelling of 37728184121 in words is "thirty-seven billion, seven hundred twenty-eight million, one hundred eighty-four thousand, one hundred twenty-one".