1616651 has 2 divisors, whose sum is σ = 1616652. Its totient is φ = 1616650.

The previous prime is 1616639. The next prime is 1616669. The reversal of 1616651 is 1566161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1616651 - 2¹⁴ = 1600267 is a prime.

It is a super-2 number, since 2×1616651² = 5227120911602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1616651.

It is not a weakly prime, because it can be changed into another prime (1616611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808325 + 808326.

It is an arithmetic number, because the mean of its divisors is an integer number (808326).

2^1616651 is an apocalyptic number.

1616651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616651 is an equidigital number, since it uses as much as digits as its factorization.

1616651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 1616651 is about 1271.4759140463. The cubic root of 1616651 is about 117.3650419711.

The spelling of 1616651 in words is "one million, six hundred sixteen thousand, six hundred fifty-one".