38991089 has 2 divisors, whose sum is σ = 38991090. Its totient is φ = 38991088.

The previous prime is 38991061. The next prime is 38991101. The reversal of 38991089 is 98019983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 9560464 = 5425^2 + 3092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38991089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38991019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19495544 + 19495545.

It is an arithmetic number, because the mean of its divisors is an integer number (19495545).

Almost surely, 2^38991089 is an apocalyptic number.

It is an amenable number.

38991089 is a deficient number, since it is larger than the sum of its proper divisors (1).

38991089 is an equidigital number, since it uses as much as digits as its factorization.

38991089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 38991089 is about 6244.2845066509. The cubic root of 38991089 is about 339.0953140561.

The spelling of 38991089 in words is "thirty-eight million, nine hundred ninety-one thousand, eighty-nine".