140231861 has 24 divisors (see below), whose sum is σ = 186540480. Its totient is φ = 102833280.

The previous prime is 140231857. The next prime is 140231867. The reversal of 140231861 is 168132041.

140231861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140231861 - 2² = 140231857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140231861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140231867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9530 + ... + 19268.

It is an arithmetic number, because the mean of its divisors is an integer number (7772520).

Almost surely, 2^140231861 is an apocalyptic number.

140231861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140231861 is a deficient number, since it is larger than the sum of its proper divisors (46308619).

140231861 is a wasteful number, since it uses less digits than its factorization.

140231861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9785 (or 9774 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 140231861 is about 11841.9534283833. The cubic root of 140231861 is about 519.5359037214.

The spelling of 140231861 in words is "one hundred forty million, two hundred thirty-one thousand, eight hundred sixty-one".