619920001 has 4 divisors (see below), whose sum is σ = 622126404. Its totient is φ = 617713600.

The previous prime is 619919999. The next prime is 619920017. The reversal of 619920001 is 100029916.

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 227285776 + 392634225 = 15076^2 + 19815^2 .

It is a cyclic number.

It is not a de Polignac number, because 619920001 - 2¹ = 619919999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619920061) 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, 1102780 + ... + 1103341.

It is an arithmetic number, because the mean of its divisors is an integer number (155531601).

Almost surely, 2^619920001 is an apocalyptic number.

It is an amenable number.

619920001 is a deficient number, since it is larger than the sum of its proper divisors (2206403).

619920001 is a wasteful number, since it uses less digits than its factorization.

619920001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206402.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 619920001 is about 24898.1927255775. The cubic root of 619920001 is about 852.6652218586.

Adding to 619920001 its reverse (100029916), we get a palindrome (719949917).

The spelling of 619920001 in words is "six hundred nineteen million, nine hundred twenty thousand, one".