619961801 has 4 divisors (see below), whose sum is σ = 620120004. Its totient is φ = 619803600.

The previous prime is 619961759. The next prime is 619961813. The reversal of 619961801 is 108169916.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37222201 + 582739600 = 6101^2 + 24140^2 .

It is a cyclic number.

It is not a de Polignac number, because 619961801 - 2⁶ = 619961737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619961851) 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, 73070 + ... + 81111.

It is an arithmetic number, because the mean of its divisors is an integer number (155030001).

Almost surely, 2^619961801 is an apocalyptic number.

It is an amenable number.

619961801 is a deficient number, since it is larger than the sum of its proper divisors (158203).

619961801 is a wasteful number, since it uses less digits than its factorization.

619961801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158202.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 619961801 is about 24899.0321297837. The cubic root of 619961801 is about 852.6843859471.

The spelling of 619961801 in words is "six hundred nineteen million, nine hundred sixty-one thousand, eight hundred one".