1351531 has 4 divisors (see below), whose sum is σ = 1359792. Its totient is φ = 1343272.

The previous prime is 1351529. The next prime is 1351541.

1351531 is nontrivially palindromic in base 10.

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 1351531 - 2¹ = 1351529 is a prime.

It is a super-2 number, since 2×1351531² = 3653272087922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1351499 and 1351508.

It is not an unprimeable number, because it can be changed into a prime (1351541) 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 3 ways as a sum of consecutive naturals, for example, 3880 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (339948).

2^1351531 is an apocalyptic number.

1351531 is a deficient number, since it is larger than the sum of its proper divisors (8261).

1351531 is an equidigital number, since it uses as much as digits as its factorization.

1351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8260.

The product of its digits is 225, while the sum is 19.

The square root of 1351531 is about 1162.5536546758. The cubic root of 1351531 is about 110.5627088215.

It can be divided in two parts, 13 and 51531, that multiplied together give a triangular number (669903 = T₁₁₅₇).

The spelling of 1351531 in words is "one million, three hundred fifty-one thousand, five hundred thirty-one".