1021646542 has 8 divisors (see below), whose sum is σ = 1751394096. Its totient is φ = 437848512.

The previous prime is 1021646471. The next prime is 1021646543. The reversal of 1021646542 is 2456461201.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021646543) 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 3 ways as a sum of consecutive naturals, for example, 36487363 + ... + 36487390.

It is an arithmetic number, because the mean of its divisors is an integer number (218924262).

Almost surely, 2^1021646542 is an apocalyptic number.

1021646542 is a deficient number, since it is larger than the sum of its proper divisors (729747554).

1021646542 is an equidigital number, since it uses as much as digits as its factorization.

1021646542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72974762.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1021646542 is about 31963.2060657250. The cubic root of 1021646542 is about 1007.1640675733.

The spelling of 1021646542 in words is "one billion, twenty-one million, six hundred forty-six thousand, five hundred forty-two".