101403905 has 4 divisors (see below), whose sum is σ = 121684692. Its totient is φ = 81123120.

The previous prime is 101403889. The next prime is 101403919. The reversal of 101403905 is 509304101.

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: 509304101 = 19 ⋅26805479.

It can be written as a sum of positive squares in 2 ways, for example, as 42406144 + 58997761 = 6512^2 + 7681^2 .

It is not a de Polignac number, because 101403905 - 2⁴ = 101403889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10140386 + ... + 10140395.

It is an arithmetic number, because the mean of its divisors is an integer number (30421173).

Almost surely, 2^101403905 is an apocalyptic number.

It is an amenable number.

101403905 is a deficient number, since it is larger than the sum of its proper divisors (20280787).

101403905 is an equidigital number, since it uses as much as digits as its factorization.

101403905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20280786.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 101403905 is about 10069.9505957080. The cubic root of 101403905 is about 466.3209136797.

The spelling of 101403905 in words is "one hundred one million, four hundred three thousand, nine hundred five".