2031451921 has 2 divisors, whose sum is σ = 2031451922. Its totient is φ = 2031451920.

The previous prime is 2031451913. The next prime is 2031451949. The reversal of 2031451921 is 1291541302.

It is an a-pointer prime, because the next prime (2031451949) can be obtained adding 2031451921 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163560321 + 867891600 = 34111^2 + 29460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031451921 - 2³ = 2031451913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2031451921.

It is not a weakly prime, because it can be changed into another prime (2031451991) 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, 1015725960 + 1015725961.

It is an arithmetic number, because the mean of its divisors is an integer number (1015725961).

Almost surely, 2^2031451921 is an apocalyptic number.

It is an amenable number.

2031451921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031451921 is an equidigital number, since it uses as much as digits as its factorization.

2031451921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2031451921 is about 45071.6309999982. The cubic root of 2031451921 is about 1266.4912181355.

The spelling of 2031451921 in words is "two billion, thirty-one million, four hundred fifty-one thousand, nine hundred twenty-one".