1213501423 has 2 divisors, whose sum is σ = 1213501424. Its totient is φ = 1213501422.

The previous prime is 1213501397. The next prime is 1213501427. The reversal of 1213501423 is 3241053121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213501423 - 2²⁵ = 1179946991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213501394 and 1213501403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213501427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606750711 + 606750712.

It is an arithmetic number, because the mean of its divisors is an integer number (606750712).

Almost surely, 2^1213501423 is an apocalyptic number.

1213501423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213501423 is an equidigital number, since it uses as much as digits as its factorization.

1213501423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1213501423 is about 34835.3473213631. The cubic root of 1213501423 is about 1066.6291048079.

Adding to 1213501423 its reverse (3241053121), we get a palindrome (4454554544).

The spelling of 1213501423 in words is "one billion, two hundred thirteen million, five hundred one thousand, four hundred twenty-three".