140311661 has 16 divisors (see below), whose sum is σ = 168480000. Its totient is φ = 114246528.

The previous prime is 140311609. The next prime is 140311669. The reversal of 140311661 is 166113041.

It is a cyclic number.

It is not a de Polignac number, because 140311661 - 2¹⁰ = 140310637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140311669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21065 + ... + 26913.

It is an arithmetic number, because the mean of its divisors is an integer number (10530000).

Almost surely, 2^140311661 is an apocalyptic number.

It is an amenable number.

140311661 is a deficient number, since it is larger than the sum of its proper divisors (28168339).

140311661 is a wasteful number, since it uses less digits than its factorization.

140311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6028.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 140311661 is about 11845.3223257115. The cubic root of 140311661 is about 519.6344336445.

The spelling of 140311661 in words is "one hundred forty million, three hundred eleven thousand, six hundred sixty-one".