1913948121 has 16 divisors (see below), whose sum is σ = 2583060480. Its totient is φ = 1260489360.

The previous prime is 1913948093. The next prime is 1913948131. The reversal of 1913948121 is 1218493191.

It is not a de Polignac number, because 1913948121 - 2¹⁰ = 1913947097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1913948121.

It is not an unprimeable number, because it can be changed into a prime (1913948131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76720 + ... + 98558.

It is an arithmetic number, because the mean of its divisors is an integer number (161441280).

Almost surely, 2^1913948121 is an apocalyptic number.

It is an amenable number.

1913948121 is a deficient number, since it is larger than the sum of its proper divisors (669112359).

1913948121 is a wasteful number, since it uses less digits than its factorization.

1913948121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22196.

The product of its digits is 15552, while the sum is 39.

The square root of 1913948121 is about 43748.6927918995. The cubic root of 1913948121 is about 1241.5857532628.

The spelling of 1913948121 in words is "one billion, nine hundred thirteen million, nine hundred forty-eight thousand, one hundred twenty-one".