37941991 has 2 divisors, whose sum is σ = 37941992. Its totient is φ = 37941990.

The previous prime is 37941989. The next prime is 37942001. The reversal of 37941991 is 19914973.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 37941991 - 2¹ = 37941989 is a prime.

Together with 37941989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37941901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18970995 + 18970996.

It is an arithmetic number, because the mean of its divisors is an integer number (18970996).

Almost surely, 2^37941991 is an apocalyptic number.

37941991 is a deficient number, since it is larger than the sum of its proper divisors (1).

37941991 is an equidigital number, since it uses as much as digits as its factorization.

37941991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 37941991 is about 6159.7070547227. The cubic root of 37941991 is about 336.0263791411.

The spelling of 37941991 in words is "thirty-seven million, nine hundred forty-one thousand, nine hundred ninety-one".