619661401 has 4 divisors (see below), whose sum is σ = 622017792. Its totient is φ = 617305012.

The previous prime is 619661353. The next prime is 619661411. The reversal of 619661401 is 104166916.

It is a happy number.

619661401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-619661401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619661411) 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, 1177801 + ... + 1178326.

It is an arithmetic number, because the mean of its divisors is an integer number (155504448).

Almost surely, 2^619661401 is an apocalyptic number.

It is an amenable number.

619661401 is a deficient number, since it is larger than the sum of its proper divisors (2356391).

619661401 is a wasteful number, since it uses less digits than its factorization.

619661401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356390.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 619661401 is about 24892.9990358735. Note that the first 3 decimals coincide. The cubic root of 619661401 is about 852.5466420991.

The spelling of 619661401 in words is "six hundred nineteen million, six hundred sixty-one thousand, four hundred one".