40491089 has 2 divisors, whose sum is σ = 40491090. Its totient is φ = 40491088.

The previous prime is 40491049. The next prime is 40491107. The reversal of 40491089 is 98019404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34281025 + 6210064 = 5855^2 + 2492^2 .

It is a cyclic number.

It is not a de Polignac number, because 40491089 - 2¹² = 40486993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40491019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20245544 + 20245545.

It is an arithmetic number, because the mean of its divisors is an integer number (20245545).

Almost surely, 2^40491089 is an apocalyptic number.

It is an amenable number.

40491089 is a deficient number, since it is larger than the sum of its proper divisors (1).

40491089 is an equidigital number, since it uses as much as digits as its factorization.

40491089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40491089 is about 6363.2608778833. The cubic root of 40491089 is about 343.3890843788.

The spelling of 40491089 in words is "forty million, four hundred ninety-one thousand, eighty-nine".