101279491 has 4 divisors (see below), whose sum is σ = 103634872. Its totient is φ = 98924112.

The previous prime is 101279461. The next prime is 101279533. The reversal of 101279491 is 194972101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194972101 = 2477 ⋅78713.

It is a cyclic number.

It is not a de Polignac number, because 101279491 - 2⁷ = 101279363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101279401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177626 + ... + 1177711.

It is an arithmetic number, because the mean of its divisors is an integer number (25908718).

Almost surely, 2^101279491 is an apocalyptic number.

101279491 is a deficient number, since it is larger than the sum of its proper divisors (2355381).

101279491 is an equidigital number, since it uses as much as digits as its factorization.

101279491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355380.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 101279491 is about 10063.7712116284. The cubic root of 101279491 is about 466.1301235466.

The spelling of 101279491 in words is "one hundred one million, two hundred seventy-nine thousand, four hundred ninety-one".