1021631253 has 8 divisors (see below), whose sum is σ = 1362345600. Its totient is φ = 681002208.

The previous prime is 1021631203. The next prime is 1021631293. The reversal of 1021631253 is 3521361201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021631253 - 2¹² = 1021627157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021631203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15913 + ... + 47921.

It is an arithmetic number, because the mean of its divisors is an integer number (170293200).

Almost surely, 2^1021631253 is an apocalyptic number.

It is an amenable number.

1021631253 is a deficient number, since it is larger than the sum of its proper divisors (340714347).

1021631253 is a wasteful number, since it uses less digits than its factorization.

1021631253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42651.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1021631253 is about 31962.9668992101. The cubic root of 1021631253 is about 1007.1590434586.

Adding to 1021631253 its reverse (3521361201), we get a palindrome (4542992454).

The spelling of 1021631253 in words is "one billion, twenty-one million, six hundred thirty-one thousand, two hundred fifty-three".