140523557 has 2 divisors, whose sum is σ = 140523558. Its totient is φ = 140523556.

The previous prime is 140523553. The next prime is 140523571. The reversal of 140523557 is 755325041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140517316 + 6241 = 11854^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 140523557 - 2² = 140523553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140523553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70261778 + 70261779.

It is an arithmetic number, because the mean of its divisors is an integer number (70261779).

Almost surely, 2^140523557 is an apocalyptic number.

It is an amenable number.

140523557 is a deficient number, since it is larger than the sum of its proper divisors (1).

140523557 is an equidigital number, since it uses as much as digits as its factorization.

140523557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 140523557 is about 11854.2632415515. The cubic root of 140523557 is about 519.8958827541.

Adding to 140523557 its reverse (755325041), we get a palindrome (895848598).

The spelling of 140523557 in words is "one hundred forty million, five hundred twenty-three thousand, five hundred fifty-seven".