1520531 has 4 divisors (see below), whose sum is σ = 1609992. Its totient is φ = 1431072.

The previous prime is 1520527. The next prime is 1520537. The reversal of 1520531 is 1350251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1520531 - 2² = 1520527 is a prime.

It is a super-2 number, since 2×1520531² = 4624029043922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 89443 = 1520531 / (1 + 5 + 2 + 0 + 5 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44705 + ... + 44738.

It is an arithmetic number, because the mean of its divisors is an integer number (402498).

2^1520531 is an apocalyptic number.

1520531 is a deficient number, since it is larger than the sum of its proper divisors (89461).

1520531 is an equidigital number, since it uses as much as digits as its factorization.

1520531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89460.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1520531 is about 1233.0981307260. The cubic root of 1520531 is about 114.9913288988.

Adding to 1520531 its reverse (1350251), we get a palindrome (2870782).

The spelling of 1520531 in words is "one million, five hundred twenty thousand, five hundred thirty-one".