19950913 has 4 divisors (see below), whose sum is σ = 20818368. Its totient is φ = 19083460.

The previous prime is 19950901. The next prime is 19950919. The reversal of 19950913 is 31905991.

It is the 1824-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19950913 - 2²¹ = 17853761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19950919) 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, 433693 + ... + 433738.

It is an arithmetic number, because the mean of its divisors is an integer number (5204592).

Almost surely, 2^19950913 is an apocalyptic number.

It is an amenable number.

19950913 is a deficient number, since it is larger than the sum of its proper divisors (867455).

19950913 is an equidigital number, since it uses as much as digits as its factorization.

19950913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867454.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 19950913 is about 4466.6444899947. The cubic root of 19950913 is about 271.2195087021.

The spelling of 19950913 in words is "nineteen million, nine hundred fifty thousand, nine hundred thirteen".