1531145 has 32 divisors (see below), whose sum is σ = 2370816. Its totient is φ = 921600.

The previous prime is 1531129. The next prime is 1531147. The reversal of 1531145 is 5411351.

It is not a de Polignac number, because 1531145 - 2⁴ = 1531129 is a prime.

It is a super-2 number, since 2×1531145² = 4688810022050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15737 + ... + 15833.

It is an arithmetic number, because the mean of its divisors is an integer number (74088).

2^1531145 is an apocalyptic number.

It is an amenable number.

1531145 is a deficient number, since it is larger than the sum of its proper divisors (839671).

1531145 is a wasteful number, since it uses less digits than its factorization.

1531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 300, while the sum is 20.

The square root of 1531145 is about 1237.3944399423. The cubic root of 1531145 is about 115.2582727062.

Adding to 1531145 its reverse (5411351), we get a palindrome (6942496).

The spelling of 1531145 in words is "one million, five hundred thirty-one thousand, one hundred forty-five".