1616040001 has 4 divisors (see below), whose sum is σ = 1620618372. Its totient is φ = 1611461632.

The previous prime is 1616039989. The next prime is 1616040047. The reversal of 1616040001 is 1000406161.

It is a happy number.

It is a Cunningham number, because it is equal to 40200²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000406161 = 61 ⋅16400101.

It can be written as a sum of positive squares in 2 ways, for example, as 656589376 + 959450625 = 25624^2 + 30975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616040001 is a prime.

It is a super-2 number, since 2×1616040001² = 5223170569664160002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616040091) 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, 2288656 + ... + 2289361.

It is an arithmetic number, because the mean of its divisors is an integer number (405154593).

Almost surely, 2^1616040001 is an apocalyptic number.

It is an amenable number.

1616040001 is a deficient number, since it is larger than the sum of its proper divisors (4578371).

1616040001 is an equidigital number, since it uses as much as digits as its factorization.

1616040001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578370.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1616040001 is about 40200.0000124378. Note that the first 4 decimals coincide. The cubic root of 1616040001 is about 1173.5025441350.

Adding to 1616040001 its reverse (1000406161), we get a palindrome (2616446162).

The spelling of 1616040001 in words is "one billion, six hundred sixteen million, forty thousand, one".