1425513721 has 2 divisors, whose sum is σ = 1425513722. Its totient is φ = 1425513720.

The previous prime is 1425513709. The next prime is 1425513731. The reversal of 1425513721 is 1273155241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1313047696 + 112466025 = 36236^2 + 10605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1425513721 - 2¹⁷ = 1425382649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1425513701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712756860 + 712756861.

It is an arithmetic number, because the mean of its divisors is an integer number (712756861).

Almost surely, 2^1425513721 is an apocalyptic number.

It is an amenable number.

1425513721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425513721 is an equidigital number, since it uses as much as digits as its factorization.

1425513721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 1425513721 is about 37755.9759640775. The cubic root of 1425513721 is about 1125.4437679076.

Adding to 1425513721 its reverse (1273155241), we get a palindrome (2698668962).

The spelling of 1425513721 in words is "one billion, four hundred twenty-five million, five hundred thirteen thousand, seven hundred twenty-one".