1531901 has 4 divisors (see below), whose sum is σ = 1750752. Its totient is φ = 1313052.

The previous prime is 1531897. The next prime is 1531909. The reversal of 1531901 is 1091351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1091351 = 61 ⋅17891.

It is a cyclic number.

It is not a de Polignac number, because 1531901 - 2² = 1531897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531909) 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 in 3 ways as a sum of consecutive naturals, for example, 109415 + ... + 109428.

It is an arithmetic number, because the mean of its divisors is an integer number (437688).

2^1531901 is an apocalyptic number.

It is an amenable number.

1531901 is a deficient number, since it is larger than the sum of its proper divisors (218851).

1531901 is an equidigital number, since it uses as much as digits as its factorization.

1531901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218850.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 1531901 is about 1237.6998828472. The cubic root of 1531901 is about 115.2772391044.

The spelling of 1531901 in words is "one million, five hundred thirty-one thousand, nine hundred one".