1020551405 has 4 divisors (see below), whose sum is σ = 1224661692. Its totient is φ = 816441120.

The previous prime is 1020551387. The next prime is 1020551419. The reversal of 1020551405 is 5041550201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5041550201 = 6841 ⋅736961.

It can be written as a sum of positive squares in 2 ways, for example, as 365344996 + 655206409 = 19114^2 + 25597^2 .

It is not a de Polignac number, because 1020551405 - 2⁸ = 1020551149 is a prime.

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, 102055136 + ... + 102055145.

It is an arithmetic number, because the mean of its divisors is an integer number (306165423).

Almost surely, 2^1020551405 is an apocalyptic number.

It is an amenable number.

1020551405 is a deficient number, since it is larger than the sum of its proper divisors (204110287).

1020551405 is an equidigital number, since it uses as much as digits as its factorization.

1020551405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204110286.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1020551405 is about 31946.0702591101. The cubic root of 1020551405 is about 1006.8040679932.

The spelling of 1020551405 in words is "one billion, twenty million, five hundred fifty-one thousand, four hundred five".