37981091 has 4 divisors (see below), whose sum is σ = 37993992. Its totient is φ = 37968192.

The previous prime is 37981087. The next prime is 37981103. The reversal of 37981091 is 19018973.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 37981091 - 2² = 37981087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37981051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (9498498).

Almost surely, 2^37981091 is an apocalyptic number.

37981091 is a deficient number, since it is larger than the sum of its proper divisors (12901).

37981091 is an equidigital number, since it uses as much as digits as its factorization.

37981091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12900.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 37981091 is about 6162.8800896983. The cubic root of 37981091 is about 336.1417668725.

The spelling of 37981091 in words is "thirty-seven million, nine hundred eighty-one thousand, ninety-one".