140250991 has 4 divisors (see below), whose sum is σ = 142026400. Its totient is φ = 138475584.

The previous prime is 140250973. The next prime is 140250997. The reversal of 140250991 is 199052041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199052041 = 883 ⋅225427.

It is a cyclic number.

It is not a de Polignac number, because 140250991 - 2⁵ = 140250959 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 (140250997) 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, 887586 + ... + 887743.

It is an arithmetic number, because the mean of its divisors is an integer number (35506600).

Almost surely, 2^140250991 is an apocalyptic number.

140250991 is a deficient number, since it is larger than the sum of its proper divisors (1775409).

140250991 is an equidigital number, since it uses as much as digits as its factorization.

140250991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775408.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 140250991 is about 11842.7611223059. The cubic root of 140250991 is about 519.5595271449.

The spelling of 140250991 in words is "one hundred forty million, two hundred fifty thousand, nine hundred ninety-one".