1021636349 has 4 divisors (see below), whose sum is σ = 1026770400. Its totient is φ = 1016502300.

The previous prime is 1021636313. The next prime is 1021636351. The reversal of 1021636349 is 9436361201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9436361201 = 211 ⋅44722091.

It is a cyclic number.

It is not a de Polignac number, because 1021636349 - 2¹² = 1021632253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021636549) 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, 2566727 + ... + 2567124.

It is an arithmetic number, because the mean of its divisors is an integer number (256692600).

Almost surely, 2^1021636349 is an apocalyptic number.

It is an amenable number.

1021636349 is a deficient number, since it is larger than the sum of its proper divisors (5134051).

1021636349 is an equidigital number, since it uses as much as digits as its factorization.

1021636349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134050.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 1021636349 is about 31963.0466163662. The cubic root of 1021636349 is about 1007.1607180595.

The spelling of 1021636349 in words is "one billion, twenty-one million, six hundred thirty-six thousand, three hundred forty-nine".