1901231 has 2 divisors, whose sum is σ = 1901232. Its totient is φ = 1901230.

The previous prime is 1901219. The next prime is 1901267. The reversal of 1901231 is 1321091.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1901231 - 2¹⁸ = 1639087 is a prime.

It is a super-2 number, since 2×1901231² = 7229358630722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901201) 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, 950615 + 950616.

It is an arithmetic number, because the mean of its divisors is an integer number (950616).

2^1901231 is an apocalyptic number.

1901231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901231 is an equidigital number, since it uses as much as digits as its factorization.

1901231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1901231 is about 1378.8513335382. The cubic root of 1901231 is about 123.8829757888.

The spelling of 1901231 in words is "one million, nine hundred one thousand, two hundred thirty-one".