1916953509 has 4 divisors (see below), whose sum is σ = 2555938016. Its totient is φ = 1277969004.

The previous prime is 1916953499. The next prime is 1916953531. The reversal of 1916953509 is 9053596191.

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 not a de Polignac number, because 1916953509 - 2⁵ = 1916953477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916953559) 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, 319492249 + ... + 319492254.

It is an arithmetic number, because the mean of its divisors is an integer number (638984504).

Almost surely, 2^1916953509 is an apocalyptic number.

It is an amenable number.

1916953509 is a deficient number, since it is larger than the sum of its proper divisors (638984507).

1916953509 is an equidigital number, since it uses as much as digits as its factorization.

1916953509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638984506.

The product of its (nonzero) digits is 328050, while the sum is 48.

The square root of 1916953509 is about 43783.0276362885. The cubic root of 1916953509 is about 1242.2352824526.

The spelling of 1916953509 in words is "one billion, nine hundred sixteen million, nine hundred fifty-three thousand, five hundred nine".