1651221425 has 12 divisors (see below), whose sum is σ = 2340016896. Its totient is φ = 1132266000.

The previous prime is 1651221421. The next prime is 1651221433. The reversal of 1651221425 is 5241221561.

It is not a de Polignac number, because 1651221425 - 2² = 1651221421 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1651221421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4717601 + ... + 4717950.

It is an arithmetic number, because the mean of its divisors is an integer number (195001408).

Almost surely, 2^1651221425 is an apocalyptic number.

It is an amenable number.

1651221425 is a deficient number, since it is larger than the sum of its proper divisors (688795471).

1651221425 is an equidigital number, since it uses as much as digits as its factorization.

1651221425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9435568 (or 9435563 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 1651221425 is about 40635.2239442580. The cubic root of 1651221425 is about 1181.9572575572.

Adding to 1651221425 its reverse (5241221561), we get a palindrome (6892442986).

The spelling of 1651221425 in words is "one billion, six hundred fifty-one million, two hundred twenty-one thousand, four hundred twenty-five".