1023431191 has 2 divisors, whose sum is σ = 1023431192. Its totient is φ = 1023431190.

The previous prime is 1023431183. The next prime is 1023431239. The reversal of 1023431191 is 1911343201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1023431191 - 2³ = 1023431183 is a prime.

It is a super-2 number, since 2×1023431191² = 2094822805423356962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023431131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511715595 + 511715596.

It is an arithmetic number, because the mean of its divisors is an integer number (511715596).

Almost surely, 2^1023431191 is an apocalyptic number.

1023431191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023431191 is an equidigital number, since it uses as much as digits as its factorization.

1023431191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1023431191 is about 31991.1111248109. Note that the first 4 decimals coincide. The cubic root of 1023431191 is about 1007.7501765907.

Adding to 1023431191 its reverse (1911343201), we get a palindrome (2934774392).

The spelling of 1023431191 in words is "one billion, twenty-three million, four hundred thirty-one thousand, one hundred ninety-one".