1021025531 has 2 divisors, whose sum is σ = 1021025532. Its totient is φ = 1021025530.

The previous prime is 1021025521. The next prime is 1021025539. The reversal of 1021025531 is 1355201201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021025531 - 2¹⁴ = 1021009147 is a prime.

It is a super-2 number, since 2×1021025531² = 2084986269907663922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021025539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510512765 + 510512766.

It is an arithmetic number, because the mean of its divisors is an integer number (510512766).

Almost surely, 2^1021025531 is an apocalyptic number.

1021025531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021025531 is an equidigital number, since it uses as much as digits as its factorization.

1021025531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1021025531 is about 31953.4901223638. The cubic root of 1021025531 is about 1006.9599569502.

Adding to 1021025531 its reverse (1355201201), we get a palindrome (2376226732).

The spelling of 1021025531 in words is "one billion, twenty-one million, twenty-five thousand, five hundred thirty-one".