1425721993 has 2 divisors, whose sum is σ = 1425721994. Its totient is φ = 1425721992.

The previous prime is 1425721991. The next prime is 1425722059. The reversal of 1425721993 is 3991275241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050602569 + 375119424 = 32413^2 + 19368^2 .

It is an emirp because it is prime and its reverse (3991275241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1425721993 - 2¹ = 1425721991 is a prime.

Together with 1425721991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1425721991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712860996 + 712860997.

It is an arithmetic number, because the mean of its divisors is an integer number (712860997).

Almost surely, 2^1425721993 is an apocalyptic number.

It is an amenable number.

1425721993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425721993 is an equidigital number, since it uses as much as digits as its factorization.

1425721993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 1425721993 is about 37758.7339962558. The cubic root of 1425721993 is about 1125.4985755198.

The spelling of 1425721993 in words is "one billion, four hundred twenty-five million, seven hundred twenty-one thousand, nine hundred ninety-three".