619691 has 4 divisors (see below), whose sum is σ = 624000. Its totient is φ = 615384.

The previous prime is 619687. The next prime is 619693. The reversal of 619691 is 196916.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 619691 - 2² = 619687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619693) 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, 1931 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (156000).

2⁶¹⁹⁶⁹¹ is an apocalyptic number.

619691 is a deficient number, since it is larger than the sum of its proper divisors (4309).

619691 is a wasteful number, since it uses less digits than its factorization.

619691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308.

The product of its digits is 2916, while the sum is 32.

The square root of 619691 is about 787.2045477511. The cubic root of 619691 is about 85.2560216247.

The spelling of 619691 in words is "six hundred nineteen thousand, six hundred ninety-one".