1020278531 has 2 divisors, whose sum is σ = 1020278532. Its totient is φ = 1020278530.

The previous prime is 1020278527. The next prime is 1020278599. The reversal of 1020278531 is 1358720201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020278531 - 2² = 1020278527 is a prime.

It is a super-2 number, since 2×1020278531² = 2081936561639035922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020278494 and 1020278503.

It is not a weakly prime, because it can be changed into another prime (1020278731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510139265 + 510139266.

It is an arithmetic number, because the mean of its divisors is an integer number (510139266).

Almost surely, 2^1020278531 is an apocalyptic number.

1020278531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020278531 is an equidigital number, since it uses as much as digits as its factorization.

1020278531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1020278531 is about 31941.7991196488. The cubic root of 1020278531 is about 1006.7143272441.

Adding to 1020278531 its reverse (1358720201), we get a palindrome (2378998732).

The spelling of 1020278531 in words is "one billion, twenty million, two hundred seventy-eight thousand, five hundred thirty-one".