1051425805 has 4 divisors (see below), whose sum is σ = 1261710972. Its totient is φ = 841140640.

The previous prime is 1051425737. The next prime is 1051425833. The reversal of 1051425805 is 5085241501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5085241501 = 17 ⋅299131853.

It can be written as a sum of positive squares in 2 ways, for example, as 758947401 + 292478404 = 27549^2 + 17102^2 .

It is not a de Polignac number, because 1051425805 - 2¹¹ = 1051423757 is a prime.

It is a super-2 number, since 2×1051425805² = 2210992446839796050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105142576 + ... + 105142585.

It is an arithmetic number, because the mean of its divisors is an integer number (315427743).

Almost surely, 2^1051425805 is an apocalyptic number.

It is an amenable number.

1051425805 is a deficient number, since it is larger than the sum of its proper divisors (210285167).

1051425805 is an equidigital number, since it uses as much as digits as its factorization.

1051425805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210285166.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 1051425805 is about 32425.6966771726. The cubic root of 1051425805 is about 1016.8562068303.

The spelling of 1051425805 in words is "one billion, fifty-one million, four hundred twenty-five thousand, eight hundred five".