101391742 has 4 divisors (see below), whose sum is σ = 152087616. Its totient is φ = 50695870.

The previous prime is 101391739. The next prime is 101391761. The reversal of 101391742 is 247193101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247193101 = 31 ⋅7973971.

It is a self number, because there is not a number n which added to its sum of digits gives 101391742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25347934 + ... + 25347937.

It is an arithmetic number, because the mean of its divisors is an integer number (38021904).

Almost surely, 2^101391742 is an apocalyptic number.

101391742 is a deficient number, since it is larger than the sum of its proper divisors (50695874).

101391742 is an equidigital number, since it uses as much as digits as its factorization.

101391742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50695873.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 101391742 is about 10069.3466520922. The cubic root of 101391742 is about 466.3022684804.

It can be divided in two parts, 10139 and 1742, that added together give a square (11881 = 109²).

The spelling of 101391742 in words is "one hundred one million, three hundred ninety-one thousand, seven hundred forty-two".