140308561 has 2 divisors, whose sum is σ = 140308562. Its totient is φ = 140308560.

The previous prime is 140308547. The next prime is 140308591. The reversal of 140308561 is 165803041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137921536 + 2387025 = 11744^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 140308561 - 2⁷ = 140308433 is a prime.

It is not a weakly prime, because it can be changed into another prime (140308501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70154280 + 70154281.

It is an arithmetic number, because the mean of its divisors is an integer number (70154281).

Almost surely, 2^140308561 is an apocalyptic number.

It is an amenable number.

140308561 is a deficient number, since it is larger than the sum of its proper divisors (1).

140308561 is an equidigital number, since it uses as much as digits as its factorization.

140308561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 140308561 is about 11845.1914716479. The cubic root of 140308561 is about 519.6306067385.

The spelling of 140308561 in words is "one hundred forty million, three hundred eight thousand, five hundred sixty-one".