38991061 has 2 divisors, whose sum is σ = 38991062. Its totient is φ = 38991060.

The previous prime is 38991037. The next prime is 38991089. The reversal of 38991061 is 16019983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 1168561 = 6150^2 + 1081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38991061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38991061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38991011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19495530 + 19495531.

It is an arithmetic number, because the mean of its divisors is an integer number (19495531).

Almost surely, 2^38991061 is an apocalyptic number.

It is an amenable number.

38991061 is a deficient number, since it is larger than the sum of its proper divisors (1).

38991061 is an equidigital number, since it uses as much as digits as its factorization.

38991061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 38991061 is about 6244.2822646002. The cubic root of 38991061 is about 339.0952328865.

The spelling of 38991061 in words is "thirty-eight million, nine hundred ninety-one thousand, sixty-one".