1913081 has 2 divisors, whose sum is σ = 1913082.
Its totient is φ = 1913080.
The previous prime is 1913069. The next prime is 1913089. The reversal of 1913081 is 1803191.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1401856 + 511225 = 1184^2 + 715^2
It is a cyclic number.
It is not a de Polignac number, because 1913081 - 26 = 1913017 is a prime.
It is a super-3 number, since 3×19130813 = 21004934429763331323, which contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1913089) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956540 + 956541.
It is an arithmetic number, because the mean of its divisors is an integer number (956541).
21913081 is an apocalyptic number.
It is an amenable number.
1913081 is a deficient number, since it is larger than the sum of its proper divisors (1).
1913081 is an equidigital number, since it uses as much as digits as its factorization.
1913081 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 216, while the sum is 23.
The square root of 1913081 is about 1383.1417136360.
The cubic root of 1913081 is about 124.1398223327.
The spelling of 1913081 in words is "one million, nine hundred thirteen thousand, eighty-one".