451051561 has 2 divisors, whose sum is σ = 451051562. Its totient is φ = 451051560.

The previous prime is 451051547. The next prime is 451051577. The reversal of 451051561 is 165150154.

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., 396010000 + 55041561 = 19900^2 + 7419^2 .

It is a cyclic number.

It is not a de Polignac number, because 451051561 - 2²¹ = 448954409 is a prime.

It is not a weakly prime, because it can be changed into another prime (451051501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225525780 + 225525781.

It is an arithmetic number, because the mean of its divisors is an integer number (225525781).

Almost surely, 2^451051561 is an apocalyptic number.

It is an amenable number.

451051561 is a deficient number, since it is larger than the sum of its proper divisors (1).

451051561 is an equidigital number, since it uses as much as digits as its factorization.

451051561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 451051561 is about 21237.9745032336. The cubic root of 451051561 is about 766.9058725751.

The spelling of 451051561 in words is "four hundred fifty-one million, fifty-one thousand, five hundred sixty-one".