140811521 has 2 divisors, whose sum is σ = 140811522. Its totient is φ = 140811520.

The previous prime is 140811511. The next prime is 140811523. The reversal of 140811521 is 125118041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86583025 + 54228496 = 9305^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 140811521 - 2⁶ = 140811457 is a prime.

Together with 140811523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140811523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70405760 + 70405761.

It is an arithmetic number, because the mean of its divisors is an integer number (70405761).

Almost surely, 2^140811521 is an apocalyptic number.

It is an amenable number.

140811521 is a deficient number, since it is larger than the sum of its proper divisors (1).

140811521 is an equidigital number, since it uses as much as digits as its factorization.

140811521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 140811521 is about 11866.4030354611. The cubic root of 140811521 is about 520.2507678555.

Adding to 140811521 its reverse (125118041), we get a palindrome (265929562).

The spelling of 140811521 in words is "one hundred forty million, eight hundred eleven thousand, five hundred twenty-one".