1020371257 has 4 divisors (see below), whose sum is σ = 1020458020. Its totient is φ = 1020284496.

The previous prime is 1020371239. The next prime is 1020371267. The reversal of 1020371257 is 7521730201.

1020371257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 445378816 + 574992441 = 21104^2 + 23979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020371257 - 2¹¹ = 1020369209 is a prime.

It is a super-2 number, since 2×1020371257² = 2082315004223520098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020371267) 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, 22338 + ... + 50395.

It is an arithmetic number, because the mean of its divisors is an integer number (255114505).

Almost surely, 2^1020371257 is an apocalyptic number.

It is an amenable number.

1020371257 is a deficient number, since it is larger than the sum of its proper divisors (86763).

1020371257 is an equidigital number, since it uses as much as digits as its factorization.

1020371257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86762.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 1020371257 is about 31943.2505703474. The cubic root of 1020371257 is about 1006.7448240683.

The spelling of 1020371257 in words is "one billion, twenty million, three hundred seventy-one thousand, two hundred fifty-seven".