140518997 has 2 divisors, whose sum is σ = 140518998. Its totient is φ = 140518996.

The previous prime is 140518967. The next prime is 140518999. The reversal of 140518997 is 799815041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140517316 + 1681 = 11854^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 140518997 - 2¹⁶ = 140453461 is a prime.

Together with 140518999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140518999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70259498 + 70259499.

It is an arithmetic number, because the mean of its divisors is an integer number (70259499).

Almost surely, 2^140518997 is an apocalyptic number.

It is an amenable number.

140518997 is a deficient number, since it is larger than the sum of its proper divisors (1).

140518997 is an equidigital number, since it uses as much as digits as its factorization.

140518997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 140518997 is about 11854.0709041240. The cubic root of 140518997 is about 519.8902591397.

It can be divided in two parts, 1405 and 18997, that added together give a palindrome (20402).

The spelling of 140518997 in words is "one hundred forty million, five hundred eighteen thousand, nine hundred ninety-seven".