1913407881 has 64 divisors (see below), whose sum is σ = 3359784960. Its totient is φ = 939090240.

The previous prime is 1913407871. The next prime is 1913407921. The reversal of 1913407881 is 1887043191.

It is not a de Polignac number, because 1913407881 - 2⁷ = 1913407753 is a prime.

It is a super-2 number, since 2×1913407881² = 7322259438145820322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1913407841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 438810 + ... + 443148.

It is an arithmetic number, because the mean of its divisors is an integer number (52496640).

Almost surely, 2^1913407881 is an apocalyptic number.

1913407881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1913407881 is a deficient number, since it is larger than the sum of its proper divisors (1446377079).

1913407881 is a wasteful number, since it uses less digits than its factorization.

1913407881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1913407881 is about 43742.5180002249. The cubic root of 1913407881 is about 1241.4689236581.

The spelling of 1913407881 in words is "one billion, nine hundred thirteen million, four hundred seven thousand, eight hundred eighty-one".