140105551 has 4 divisors (see below), whose sum is σ = 148347072. Its totient is φ = 131864032.

The previous prime is 140105521. The next prime is 140105557. The reversal of 140105551 is 155501041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 140105551 - 2⁵ = 140105519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140105557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4120735 + ... + 4120768.

It is an arithmetic number, because the mean of its divisors is an integer number (37086768).

Almost surely, 2^140105551 is an apocalyptic number.

140105551 is a deficient number, since it is larger than the sum of its proper divisors (8241521).

140105551 is an equidigital number, since it uses as much as digits as its factorization.

140105551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8241520.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 140105551 is about 11836.6190696499. The cubic root of 140105551 is about 519.3798709626.

Adding to 140105551 its reverse (155501041), we get a palindrome (295606592).

The spelling of 140105551 in words is "one hundred forty million, one hundred five thousand, five hundred fifty-one".