619881 has 4 divisors (see below), whose sum is σ = 826512. Its totient is φ = 413252.

The previous prime is 619867. The next prime is 619897. The reversal of 619881 is 188916.

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 619881 - 2⁵ = 619849 is a prime.

It is a super-2 number, since 2×619881² = 768504908322, which contains 22 as substring.

It is a D-number.

619881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (619811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103311 + ... + 103316.

It is an arithmetic number, because the mean of its divisors is an integer number (206628).

2⁶¹⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

619881 is a deficient number, since it is larger than the sum of its proper divisors (206631).

619881 is a wasteful number, since it uses less digits than its factorization.

619881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206630.

The product of its digits is 3456, while the sum is 33.

The square root of 619881 is about 787.3252186994. The cubic root of 619881 is about 85.2647340254.

The spelling of 619881 in words is "six hundred nineteen thousand, eight hundred eighty-one".