1516231 has 2 divisors, whose sum is σ = 1516232. Its totient is φ = 1516230.

The previous prime is 1516217. The next prime is 1516243. The reversal of 1516231 is 1326151.

It is a strong prime.

It is an emirp because it is prime and its reverse (1326151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1516231 - 2⁵ = 1516199 is a prime.

It is a super-2 number, since 2×1516231² = 4597912890722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1516199 and 1516208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516261) 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 as a sum of consecutive naturals, namely, 758115 + 758116.

It is an arithmetic number, because the mean of its divisors is an integer number (758116).

2^1516231 is an apocalyptic number.

1516231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516231 is an equidigital number, since it uses as much as digits as its factorization.

1516231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 1516231 is about 1231.3533205380. The cubic root of 1516231 is about 114.8828296191.

Adding to 1516231 its product of digits (180), we get a triangular number (1516411 = T₁₇₄₁).

The spelling of 1516231 in words is "one million, five hundred sixteen thousand, two hundred thirty-one".