1550231 has 2 divisors, whose sum is σ = 1550232. Its totient is φ = 1550230.

The previous prime is 1550221. The next prime is 1550233. The reversal of 1550231 is 1320551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1550231 - 2⁶ = 1550167 is a prime.

It is a super-2 number, since 2×1550231² = 4806432306722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1550233, 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 (1550233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775115 + 775116.

It is an arithmetic number, because the mean of its divisors is an integer number (775116).

2^1550231 is an apocalyptic number.

1550231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550231 is an equidigital number, since it uses as much as digits as its factorization.

1550231 is an evil number, because the sum of its binary digits is even.

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

The square root of 1550231 is about 1245.0827281751. The cubic root of 1550231 is about 115.7352015813.

Adding to 1550231 its reverse (1320551), we get a palindrome (2870782).

The spelling of 1550231 in words is "one million, five hundred fifty thousand, two hundred thirty-one".