1451130721 has 2 divisors, whose sum is σ = 1451130722. Its totient is φ = 1451130720.

The previous prime is 1451130691. The next prime is 1451130827. The reversal of 1451130721 is 1270311541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1331447121 + 119683600 = 36489^2 + 10940^2 .

It is an emirp because it is prime and its reverse (1270311541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1451130721 - 2⁹ = 1451130209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1451160721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 725565360 + 725565361.

It is an arithmetic number, because the mean of its divisors is an integer number (725565361).

Almost surely, 2^1451130721 is an apocalyptic number.

It is an amenable number.

1451130721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1451130721 is an equidigital number, since it uses as much as digits as its factorization.

1451130721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1451130721 is about 38093.7097300854. The cubic root of 1451130721 is about 1132.1453282370.

The spelling of 1451130721 in words is "one billion, four hundred fifty-one million, one hundred thirty thousand, seven hundred twenty-one".