40523451989 has 2 divisors, whose sum is σ = 40523451990. Its totient is φ = 40523451988.

The previous prime is 40523451979. The next prime is 40523452027. The reversal of 40523451989 is 98915432504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33806338225 + 6717113764 = 183865^2 + 81958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40523451989 is a prime.

It is a super-2 number, since 2×40523451989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40523451979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20261725994 + 20261725995.

It is an arithmetic number, because the mean of its divisors is an integer number (20261725995).

Almost surely, 2^40523451989 is an apocalyptic number.

It is an amenable number.

40523451989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40523451989 is an equidigital number, since it uses as much as digits as its factorization.

40523451989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 40523451989 in words is "forty billion, five hundred twenty-three million, four hundred fifty-one thousand, nine hundred eighty-nine".