140511781 has 2 divisors, whose sum is σ = 140511782. Its totient is φ = 140511780.

The previous prime is 140511773. The next prime is 140511799. The reversal of 140511781 is 187115041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140209281 + 302500 = 11841^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 140511781 - 2³ = 140511773 is a prime.

It is a super-2 number, since 2×140511781² = 39487121199583922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140511181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70255890 + 70255891.

It is an arithmetic number, because the mean of its divisors is an integer number (70255891).

Almost surely, 2^140511781 is an apocalyptic number.

It is an amenable number.

140511781 is a deficient number, since it is larger than the sum of its proper divisors (1).

140511781 is an equidigital number, since it uses as much as digits as its factorization.

140511781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 140511781 is about 11853.7665322040. The cubic root of 140511781 is about 519.8813597681.

The spelling of 140511781 in words is "one hundred forty million, five hundred eleven thousand, seven hundred eighty-one".