451402981 has 2 divisors, whose sum is σ = 451402982. Its totient is φ = 451402980.

The previous prime is 451402979. The next prime is 451403003. The reversal of 451402981 is 189204154.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363512356 + 87890625 = 19066^2 + 9375^2 .

It is a cyclic number.

It is not a de Polignac number, because 451402981 - 2¹ = 451402979 is a prime.

It is a super-2 number, since 2×451402981² = 407529302511372722, which contains 22 as substring.

Together with 451402979, 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 (451402781) 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, 225701490 + 225701491.

It is an arithmetic number, because the mean of its divisors is an integer number (225701491).

Almost surely, 2^451402981 is an apocalyptic number.

It is an amenable number.

451402981 is a deficient number, since it is larger than the sum of its proper divisors (1).

451402981 is an equidigital number, since it uses as much as digits as its factorization.

451402981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 451402981 is about 21246.2462802256. The cubic root of 451402981 is about 767.1049895745.

The spelling of 451402981 in words is "four hundred fifty-one million, four hundred two thousand, nine hundred eighty-one".