1555001 has 8 divisors (see below), whose sum is σ = 1787904. Its totient is φ = 1324800.

The previous prime is 1554989. The next prime is 1555013. The reversal of 1555001 is 1005551.

It is an interprime number because it is at equal distance from previous prime (1554989) and next prime (1555013).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1555001 - 2¹⁴ = 1538617 is a prime.

It is a super-2 number, since 2×1555001² = 4836056220002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555051) 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 in 7 ways as a sum of consecutive naturals, for example, 776 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (223488).

2^1555001 is an apocalyptic number.

It is an amenable number.

1555001 is a deficient number, since it is larger than the sum of its proper divisors (232903).

1555001 is a wasteful number, since it uses less digits than its factorization.

1555001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 1555001 is about 1246.9967922974. The cubic root of 1555001 is about 115.8537842653.

The spelling of 1555001 in words is "one million, five hundred fifty-five thousand, one".