140520491509 has 2 divisors, whose sum is σ = 140520491510. Its totient is φ = 140520491508.

The previous prime is 140520491491. The next prime is 140520491519. The reversal of 140520491509 is 905194025041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136703970225 + 3816521284 = 369735^2 + 61778^2 .

It is a cyclic number.

It is not a de Polignac number, because 140520491509 - 2⁷ = 140520491381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140520491519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70260245754 + 70260245755.

It is an arithmetic number, because the mean of its divisors is an integer number (70260245755).

Almost surely, 2^140520491509 is an apocalyptic number.

It is an amenable number.

140520491509 is a deficient number, since it is larger than the sum of its proper divisors (1).

140520491509 is an equidigital number, since it uses as much as digits as its factorization.

140520491509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 140520491509 in words is "one hundred forty billion, five hundred twenty million, four hundred ninety-one thousand, five hundred nine".