1913416781 has 8 divisors (see below), whose sum is σ = 1981183800. Its totient is φ = 1845768960.

The previous prime is 1913416763. The next prime is 1913416783. The reversal of 1913416781 is 1876143191.

It can be written as a sum of positive squares in 4 ways, for example, as 336135556 + 1577281225 = 18334^2 + 39715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1913416781 - 2¹⁴ = 1913400397 is a prime.

It is a super-2 number, since 2×1913416781² = 7322327555624803922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913416783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3521 + ... + 61961.

It is an arithmetic number, because the mean of its divisors is an integer number (247647975).

Almost surely, 2^1913416781 is an apocalyptic number.

It is an amenable number.

1913416781 is a deficient number, since it is larger than the sum of its proper divisors (67767019).

1913416781 is a wasteful number, since it uses less digits than its factorization.

1913416781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59599.

The product of its digits is 36288, while the sum is 41.

The square root of 1913416781 is about 43742.6197317902. The cubic root of 1913416781 is about 1241.4708485058.

The spelling of 1913416781 in words is "one billion, nine hundred thirteen million, four hundred sixteen thousand, seven hundred eighty-one".