1913016649 has 4 divisors (see below), whose sum is σ = 1945440720. Its totient is φ = 1880592580.

The previous prime is 1913016643. The next prime is 1913016683. The reversal of 1913016649 is 9466103191.

It is a happy 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 1913016649 - 2²⁷ = 1778798921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913016643) 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, 16211947 + ... + 16212064.

It is an arithmetic number, because the mean of its divisors is an integer number (486360180).

Almost surely, 2^1913016649 is an apocalyptic number.

It is an amenable number.

1913016649 is a deficient number, since it is larger than the sum of its proper divisors (32424071).

1913016649 is an equidigital number, since it uses as much as digits as its factorization.

1913016649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32424070.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 1913016649 is about 43738.0457839625. The cubic root of 1913016649 is about 1241.3843040496.

The spelling of 1913016649 in words is "one billion, nine hundred thirteen million, sixteen thousand, six hundred forty-nine".