1201553923 has 2 divisors, whose sum is σ = 1201553924. Its totient is φ = 1201553922.

The previous prime is 1201553921. The next prime is 1201553953. The reversal of 1201553923 is 3293551021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201553923 - 2¹ = 1201553921 is a prime.

It is a super-3 number, since 3×1201553923³ (a number of 28 digits) contains 333 as substring.

Together with 1201553921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1201553921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600776961 + 600776962.

It is an arithmetic number, because the mean of its divisors is an integer number (600776962).

Almost surely, 2^1201553923 is an apocalyptic number.

1201553923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201553923 is an equidigital number, since it uses as much as digits as its factorization.

1201553923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 1201553923 is about 34663.4378416221. The cubic root of 1201553923 is about 1063.1170628862.

The spelling of 1201553923 in words is "one billion, two hundred one million, five hundred fifty-three thousand, nine hundred twenty-three".