1616551 has 2 divisors, whose sum is σ = 1616552. Its totient is φ = 1616550.

The previous prime is 1616543. The next prime is 1616569. The reversal of 1616551 is 1556161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1616551 - 2³ = 1616543 is a prime.

It is a super-2 number, since 2×1616551² = 5226474271202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808275 + 808276.

It is an arithmetic number, because the mean of its divisors is an integer number (808276).

2^1616551 is an apocalyptic number.

1616551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616551 is an equidigital number, since it uses as much as digits as its factorization.

1616551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 25.

The square root of 1616551 is about 1271.4365890598. The cubic root of 1616551 is about 117.3626220000.

The spelling of 1616551 in words is "one million, six hundred sixteen thousand, five hundred fifty-one".