37221091 has 2 divisors, whose sum is σ = 37221092. Its totient is φ = 37221090.

The previous prime is 37221077. The next prime is 37221103. The reversal of 37221091 is 19012273.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 37221091 - 2¹⁵ = 37188323 is a prime.

It is not a weakly prime, because it can be changed into another prime (37221011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18610545 + 18610546.

It is an arithmetic number, because the mean of its divisors is an integer number (18610546).

Almost surely, 2^37221091 is an apocalyptic number.

37221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

37221091 is an equidigital number, since it uses as much as digits as its factorization.

37221091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 37221091 is about 6100.9090306281. The cubic root of 37221091 is about 333.8845830908.

The spelling of 37221091 in words is "thirty-seven million, two hundred twenty-one thousand, ninety-one".