1428981641 has 4 divisors (see below), whose sum is σ = 1478256900. Its totient is φ = 1379706384.

The previous prime is 1428981629. The next prime is 1428981649. The reversal of 1428981641 is 1461898241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1461898241 = 331 ⋅4416611.

It can be written as a sum of positive squares in 2 ways, for example, as 519657616 + 909324025 = 22796^2 + 30155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428981641 - 2²² = 1424787337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1428981592 and 1428981601.

It is not an unprimeable number, because it can be changed into a prime (1428981649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24637586 + ... + 24637643.

It is an arithmetic number, because the mean of its divisors is an integer number (369564225).

Almost surely, 2^1428981641 is an apocalyptic number.

It is an amenable number.

1428981641 is a deficient number, since it is larger than the sum of its proper divisors (49275259).

1428981641 is an equidigital number, since it uses as much as digits as its factorization.

1428981641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49275258.

The product of its digits is 110592, while the sum is 44.

The square root of 1428981641 is about 37801.8735117719. The cubic root of 1428981641 is about 1126.3556703319.

The spelling of 1428981641 in words is "one billion, four hundred twenty-eight million, nine hundred eighty-one thousand, six hundred forty-one".