140321081 has 2 divisors, whose sum is σ = 140321082. Its totient is φ = 140321080.

The previous prime is 140321021. The next prime is 140321087. The reversal of 140321081 is 180123041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129595456 + 10725625 = 11384^2 + 3275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140321081 is a prime.

It is a super-2 number, since 2×140321081² = 39380011546017122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (140321087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70160540 + 70160541.

It is an arithmetic number, because the mean of its divisors is an integer number (70160541).

Almost surely, 2^140321081 is an apocalyptic number.

It is an amenable number.

140321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

140321081 is an equidigital number, since it uses as much as digits as its factorization.

140321081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 140321081 is about 11845.7199443512. The cubic root of 140321081 is about 519.6460621549.

The spelling of 140321081 in words is "one hundred forty million, three hundred twenty-one thousand, eighty-one".