1555951 has 2 divisors, whose sum is σ = 1555952. Its totient is φ = 1555950.

The previous prime is 1555943. The next prime is 1555963. The reversal of 1555951 is 1595551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1555951 - 2³ = 1555943 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777975 + 777976.

It is an arithmetic number, because the mean of its divisors is an integer number (777976).

2^1555951 is an apocalyptic number.

1555951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555951 is an equidigital number, since it uses as much as digits as its factorization.

1555951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5625, while the sum is 31.

The square root of 1555951 is about 1247.3776493107. The cubic root of 1555951 is about 115.8773723936.

The spelling of 1555951 in words is "one million, five hundred fifty-five thousand, nine hundred fifty-one".