1913281 has 4 divisors (see below), whose sum is σ = 2014000. Its totient is φ = 1812564.

The previous prime is 1913273. The next prime is 1913287. The reversal of 1913281 is 1823191.

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 a cyclic number.

It is not a de Polignac number, because 1913281 - 2³ = 1913273 is a prime.

It is a super-2 number, since 2×1913281² = 7321288369922, which contains 22 as substring.

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (1913287) 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, 50331 + ... + 50368.

It is an arithmetic number, because the mean of its divisors is an integer number (503500).

2^1913281 is an apocalyptic number.

It is an amenable number.

1913281 is a deficient number, since it is larger than the sum of its proper divisors (100719).

1913281 is a wasteful number, since it uses less digits than its factorization.

1913281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100718.

The product of its digits is 432, while the sum is 25.

The square root of 1913281 is about 1383.2140109181. The cubic root of 1913281 is about 124.1441481818.

The spelling of 1913281 in words is "one million, nine hundred thirteen thousand, two hundred eighty-one".