140635561 has 16 divisors (see below), whose sum is σ = 160989696. Its totient is φ = 121680000.

The previous prime is 140635513. The next prime is 140635567. The reversal of 140635561 is 165536041.

140635561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 4-Lehmer number, since φ(140635561) divides (140635561-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 140635561 - 2¹¹ = 140633513 is a prime.

It is a super-2 number, since 2×140635561² = 39556722035569442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (140635567) 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, 17421 + ... + 24181.

It is an arithmetic number, because the mean of its divisors is an integer number (10061856).

Almost surely, 2^140635561 is an apocalyptic number.

140635561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

140635561 is the 5304-th centered decagonal number.

It is an amenable number.

140635561 is a deficient number, since it is larger than the sum of its proper divisors (20354135).

140635561 is a wasteful number, since it uses less digits than its factorization.

140635561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 140635561 is about 11858.9865081296. The cubic root of 140635561 is about 520.0339733721.

The spelling of 140635561 in words is "one hundred forty million, six hundred thirty-five thousand, five hundred sixty-one".