1557151 has 2 divisors, whose sum is σ = 1557152. Its totient is φ = 1557150.

The previous prime is 1557137. The next prime is 1557211. The reversal of 1557151 is 1517551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1557151 - 2⁵ = 1557119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778575 + 778576.

It is an arithmetic number, because the mean of its divisors is an integer number (778576).

2^1557151 is an apocalyptic number.

1557151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557151 is an equidigital number, since it uses as much as digits as its factorization.

1557151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 875, while the sum is 25.

The square root of 1557151 is about 1247.8585657037. The cubic root of 1557151 is about 115.9071542044.

The spelling of 1557151 in words is "one million, five hundred fifty-seven thousand, one hundred fifty-one".