1551901 has 16 divisors (see below), whose sum is σ = 1805440. Its totient is φ = 1321920.

The previous prime is 1551899. The next prime is 1551911. The reversal of 1551901 is 1091551.

It is a cyclic number.

It is not a de Polignac number, because 1551901 - 2¹ = 1551899 is a prime.

1551901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551911) 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 15 ways as a sum of consecutive naturals, for example, 15016 + ... + 15118.

It is an arithmetic number, because the mean of its divisors is an integer number (112840).

2^1551901 is an apocalyptic number.

It is an amenable number.

1551901 is a deficient number, since it is larger than the sum of its proper divisors (253539).

1551901 is a wasteful number, since it uses less digits than its factorization.

1551901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 1551901 is about 1245.7531858278. The cubic root of 1551901 is about 115.7767455887.

The spelling of 1551901 in words is "one million, five hundred fifty-one thousand, nine hundred one".