1551617 has 2 divisors, whose sum is σ = 1551618. Its totient is φ = 1551616.

The previous prime is 1551601. The next prime is 1551619. The reversal of 1551617 is 7161551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 261121 = 1136^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551617 - 2⁴ = 1551601 is a prime.

Together with 1551619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1551619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775808 + 775809.

It is an arithmetic number, because the mean of its divisors is an integer number (775809).

2^1551617 is an apocalyptic number.

It is an amenable number.

1551617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551617 is an equidigital number, since it uses as much as digits as its factorization.

1551617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 26.

The square root of 1551617 is about 1245.6391933461. The cubic root of 1551617 is about 115.7696827238.

The spelling of 1551617 in words is "one million, five hundred fifty-one thousand, six hundred seventeen".