140811557 has 2 divisors, whose sum is σ = 140811558. Its totient is φ = 140811556.

The previous prime is 140811553. The next prime is 140811571. The reversal of 140811557 is 755118041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140161921 + 649636 = 11839^2 + 806^2 .

It is an emirp because it is prime and its reverse (755118041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140811557 - 2² = 140811553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140811553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70405778 + 70405779.

It is an arithmetic number, because the mean of its divisors is an integer number (70405779).

Almost surely, 2^140811557 is an apocalyptic number.

It is an amenable number.

140811557 is a deficient number, since it is larger than the sum of its proper divisors (1).

140811557 is an equidigital number, since it uses as much as digits as its factorization.

140811557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 140811557 is about 11866.4045523486. The cubic root of 140811557 is about 520.2508121914.

Adding to 140811557 its reverse (755118041), we get a palindrome (895929598).

The spelling of 140811557 in words is "one hundred forty million, eight hundred eleven thousand, five hundred fifty-seven".