140645731 has 2 divisors, whose sum is σ = 140645732. Its totient is φ = 140645730.

The previous prime is 140645723. The next prime is 140645749. The reversal of 140645731 is 137546041.

It is a weak prime.

It is an emirp because it is prime and its reverse (137546041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140645731 - 2³ = 140645723 is a prime.

It is a super-2 number, since 2×140645731² = 39562443297048722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 140645693 and 140645702.

It is not a weakly prime, because it can be changed into another prime (140645711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70322865 + 70322866.

It is an arithmetic number, because the mean of its divisors is an integer number (70322866).

Almost surely, 2^140645731 is an apocalyptic number.

140645731 is a deficient number, since it is larger than the sum of its proper divisors (1).

140645731 is an equidigital number, since it uses as much as digits as its factorization.

140645731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 140645731 is about 11859.4152891279. The cubic root of 140645731 is about 520.0465084142.

It can be divided in two parts, 140645 and 731, that added together give a square (141376 = 376²).

The spelling of 140645731 in words is "one hundred forty million, six hundred forty-five thousand, seven hundred thirty-one".