140890961 has 4 divisors (see below), whose sum is σ = 145749300. Its totient is φ = 136032624.

The previous prime is 140890901. The next prime is 140890963. The reversal of 140890961 is 169098041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169098041 = 7 ⋅24156863.

It can be written as a sum of positive squares in 2 ways, for example, as 79566400 + 61324561 = 8920^2 + 7831^2 .

It is a cyclic number.

It is not a de Polignac number, because 140890961 - 2²⁶ = 73782097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140890963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2429126 + ... + 2429183.

It is an arithmetic number, because the mean of its divisors is an integer number (36437325).

Almost surely, 2^140890961 is an apocalyptic number.

It is an amenable number.

140890961 is a deficient number, since it is larger than the sum of its proper divisors (4858339).

140890961 is an equidigital number, since it uses as much as digits as its factorization.

140890961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4858338.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 140890961 is about 11869.7498288717. The cubic root of 140890961 is about 520.3485840738.

The spelling of 140890961 in words is "one hundred forty million, eight hundred ninety thousand, nine hundred sixty-one".