619808561 has 16 divisors (see below), whose sum is σ = 649728000. Its totient is φ = 590520000.

The previous prime is 619808543. The next prime is 619808573. The reversal of 619808561 is 165808916.

It is a cyclic number.

It is not a de Polignac number, because 619808561 - 2¹⁴ = 619792177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619808461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 824936 + ... + 825686.

It is an arithmetic number, because the mean of its divisors is an integer number (40608000).

Almost surely, 2^619808561 is an apocalyptic number.

It is an amenable number.

619808561 is a deficient number, since it is larger than the sum of its proper divisors (29919439).

619808561 is a wasteful number, since it uses less digits than its factorization.

619808561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 619808561 is about 24895.9547115591. The cubic root of 619808561 is about 852.6141256384.

The spelling of 619808561 in words is "six hundred nineteen million, eight hundred eight thousand, five hundred sixty-one".