1613881 has 4 divisors (see below), whose sum is σ = 1629072. Its totient is φ = 1598692.

The previous prime is 1613873. The next prime is 1613921. The reversal of 1613881 is 1883161.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1883161 = 7 ⋅269023.

It is a cyclic number.

It is not a de Polignac number, because 1613881 - 2³ = 1613873 is a prime.

It is a super-2 number, since 2×1613881² = 5209223764322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1613831) 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, 7435 + ... + 7648.

It is an arithmetic number, because the mean of its divisors is an integer number (407268).

2^1613881 is an apocalyptic number.

It is an amenable number.

1613881 is a deficient number, since it is larger than the sum of its proper divisors (15191).

1613881 is a wasteful number, since it uses less digits than its factorization.

1613881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15190.

The product of its digits is 1152, while the sum is 28.

The square root of 1613881 is about 1270.3861617634. The cubic root of 1613881 is about 117.2979718322.

The spelling of 1613881 in words is "one million, six hundred thirteen thousand, eight hundred eighty-one".