37043989921 has 2 divisors, whose sum is σ = 37043989922. Its totient is φ = 37043989920.

The previous prime is 37043989889. The next prime is 37043989949. The reversal of 37043989921 is 12998934073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23317290000 + 13726699921 = 152700^2 + 117161^2 .

It is an emirp because it is prime and its reverse (12998934073) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37043989921 - 2⁵ = 37043989889 is a prime.

It is not a weakly prime, because it can be changed into another prime (37043989951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18521994960 + 18521994961.

It is an arithmetic number, because the mean of its divisors is an integer number (18521994961).

Almost surely, 2^37043989921 is an apocalyptic number.

It is an amenable number.

37043989921 is a deficient number, since it is larger than the sum of its proper divisors (1).

37043989921 is an equidigital number, since it uses as much as digits as its factorization.

37043989921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 37043989921 in words is "thirty-seven billion, forty-three million, nine hundred eighty-nine thousand, nine hundred twenty-one".