40451689 has 2 divisors, whose sum is σ = 40451690. Its totient is φ = 40451688.

The previous prime is 40451651. The next prime is 40451701. The reversal of 40451689 is 98615404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34715664 + 5736025 = 5892^2 + 2395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40451689 is a prime.

It is not a weakly prime, because it can be changed into another prime (40451189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20225844 + 20225845.

It is an arithmetic number, because the mean of its divisors is an integer number (20225845).

Almost surely, 2^40451689 is an apocalyptic number.

It is an amenable number.

40451689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40451689 is an equidigital number, since it uses as much as digits as its factorization.

40451689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 40451689 is about 6360.1642274394. The cubic root of 40451689 is about 343.2776695716.

The spelling of 40451689 in words is "forty million, four hundred fifty-one thousand, six hundred eighty-nine".