1511231 has 2 divisors, whose sum is σ = 1511232. Its totient is φ = 1511230.

The previous prime is 1511227. The next prime is 1511233. The reversal of 1511231 is 1321151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1511231 - 2² = 1511227 is a prime.

It is a super-2 number, since 2×1511231² = 4567638270722, which contains 22 as substring.

Together with 1511233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1511233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 755615 + 755616.

It is an arithmetic number, because the mean of its divisors is an integer number (755616).

2^1511231 is an apocalyptic number.

1511231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1511231 is an equidigital number, since it uses as much as digits as its factorization.

1511231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30, while the sum is 14.

The square root of 1511231 is about 1229.3213574977. The cubic root of 1511231 is about 114.7564094116.

Adding to 1511231 its reverse (1321151), we get a palindrome (2832382).

The spelling of 1511231 in words is "one million, five hundred eleven thousand, two hundred thirty-one".