140143531 has 24 divisors (see below), whose sum is σ = 165205152. Its totient is φ = 118483200.

The previous prime is 140143499. The next prime is 140143537. The reversal of 140143531 is 135341041.

It is not a de Polignac number, because 140143531 - 2⁵ = 140143499 is a prime.

It is a super-2 number, since 2×140143531² = 39280418562295922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140143537) 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, 102291 + ... + 103651.

It is an arithmetic number, because the mean of its divisors is an integer number (6883548).

Almost surely, 2^140143531 is an apocalyptic number.

140143531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

140143531 is a deficient number, since it is larger than the sum of its proper divisors (25061621).

140143531 is a wasteful number, since it uses less digits than its factorization.

140143531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 140143531 is about 11838.2233041956. The cubic root of 140143531 is about 519.4267981190.

Adding to 140143531 its reverse (135341041), we get a palindrome (275484572).

The spelling of 140143531 in words is "one hundred forty million, one hundred forty-three thousand, five hundred thirty-one".