10209919 has 4 divisors (see below), whose sum is σ = 10261944. Its totient is φ = 10157896.

The previous prime is 10209883. The next prime is 10209931. The reversal of 10209919 is 91990201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91990201 = 43 ⋅2139307.

It is a cyclic number.

It is not a de Polignac number, because 10209919 - 2²³ = 1821311 is a prime.

It is a super-2 number, since 2×10209919² = 208484891973122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10209119) 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, 25717 + ... + 26110.

It is an arithmetic number, because the mean of its divisors is an integer number (2565486).

Almost surely, 2^10209919 is an apocalyptic number.

10209919 is a deficient number, since it is larger than the sum of its proper divisors (52025).

10209919 is an equidigital number, since it uses as much as digits as its factorization.

10209919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52024.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 10209919 is about 3195.2963868787. The cubic root of 10209919 is about 216.9405643249.

The spelling of 10209919 in words is "ten million, two hundred nine thousand, nine hundred nineteen".