1913437921 has 4 divisors (see below), whose sum is σ = 2014145200. Its totient is φ = 1812730644.

The previous prime is 1913437871. The next prime is 1913437963. The reversal of 1913437921 is 1297343191.

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 1913437921 - 2¹¹ = 1913435873 is a prime.

It is a super-2 number, since 2×1913437921² = 7322489355041604482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913431921) 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, 50353611 + ... + 50353648.

It is an arithmetic number, because the mean of its divisors is an integer number (503536300).

Almost surely, 2^1913437921 is an apocalyptic number.

It is an amenable number.

1913437921 is a deficient number, since it is larger than the sum of its proper divisors (100707279).

1913437921 is a wasteful number, since it uses less digits than its factorization.

1913437921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100707278.

The product of its digits is 40824, while the sum is 40.

The square root of 1913437921 is about 43742.8613718856. The cubic root of 1913437921 is about 1241.4754205358.

The spelling of 1913437921 in words is "one billion, nine hundred thirteen million, four hundred thirty-seven thousand, nine hundred twenty-one".