37555981 has 2 divisors, whose sum is σ = 37555982. Its totient is φ = 37555980.

The previous prime is 37555949. The next prime is 37556003. The reversal of 37555981 is 18955573.

37555981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22610025 + 14945956 = 4755^2 + 3866^2 .

It is a cyclic number.

It is not a de Polignac number, because 37555981 - 2⁵ = 37555949 is a prime.

It is a super-2 number, since 2×37555981² = 2820903417744722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37555901) 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 as a sum of consecutive naturals, namely, 18777990 + 18777991.

It is an arithmetic number, because the mean of its divisors is an integer number (18777991).

Almost surely, 2^37555981 is an apocalyptic number.

It is an amenable number.

37555981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37555981 is an equidigital number, since it uses as much as digits as its factorization.

37555981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The square root of 37555981 is about 6128.2934818757. The cubic root of 37555981 is about 334.8829501223.

The spelling of 37555981 in words is "thirty-seven million, five hundred fifty-five thousand, nine hundred eighty-one".