1201623391 has 2 divisors, whose sum is σ = 1201623392. Its totient is φ = 1201623390.

The previous prime is 1201623389. The next prime is 1201623469. The reversal of 1201623391 is 1933261021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201623391 - 2¹ = 1201623389 is a prime.

Together with 1201623389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201623331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600811695 + 600811696.

It is an arithmetic number, because the mean of its divisors is an integer number (600811696).

Almost surely, 2^1201623391 is an apocalyptic number.

1201623391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201623391 is an equidigital number, since it uses as much as digits as its factorization.

1201623391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1201623391 is about 34664.4398627758. The cubic root of 1201623391 is about 1063.1375505762.

The spelling of 1201623391 in words is "one billion, two hundred one million, six hundred twenty-three thousand, three hundred ninety-one".