451121989 has 2 divisors, whose sum is σ = 451121990. Its totient is φ = 451121988.

The previous prime is 451121971. The next prime is 451122011. The reversal of 451121989 is 989121154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448719489 + 2402500 = 21183^2 + 1550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-451121989 is a prime.

It is a super-2 number, since 2×451121989² = 407022097918632242, which contains 22 as substring.

It is equal to p_23909287 and since 451121989 and 23909287 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225560994 + 225560995.

It is an arithmetic number, because the mean of its divisors is an integer number (225560995).

Almost surely, 2^451121989 is an apocalyptic number.

It is an amenable number.

451121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

451121989 is an equidigital number, since it uses as much as digits as its factorization.

451121989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The square root of 451121989 is about 21239.6325062370. The cubic root of 451121989 is about 766.9457858508.

The spelling of 451121989 in words is "four hundred fifty-one million, one hundred twenty-one thousand, nine hundred eighty-nine".