451151221 has 2 divisors, whose sum is σ = 451151222. Its totient is φ = 451151220.

The previous prime is 451151201. The next prime is 451151243. The reversal of 451151221 is 122151154.

It is an a-pointer prime, because the next prime (451151243) can be obtained adding 451151221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 23902321 = 20670^2 + 4889^2 .

It is a cyclic number.

It is not a de Polignac number, because 451151221 - 2⁵ = 451151189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 451151192 and 451151201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451151201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225575610 + 225575611.

It is an arithmetic number, because the mean of its divisors is an integer number (225575611).

Almost surely, 2^451151221 is an apocalyptic number.

It is an amenable number.

451151221 is a deficient number, since it is larger than the sum of its proper divisors (1).

451151221 is an equidigital number, since it uses as much as digits as its factorization.

451151221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 22.

The square root of 451151221 is about 21240.3206425892. The cubic root of 451151221 is about 766.9623511225.

The spelling of 451151221 in words is "four hundred fifty-one million, one hundred fifty-one thousand, two hundred twenty-one".