1021632945 has 32 divisors (see below), whose sum is σ = 1722691200. Its totient is φ = 515579904.

The previous prime is 1021632881. The next prime is 1021632949. The reversal of 1021632945 is 5492361201.

It is not a de Polignac number, because 1021632945 - 2⁶ = 1021632881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021632949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327051 + ... + 330159.

It is an arithmetic number, because the mean of its divisors is an integer number (53834100).

Almost surely, 2^1021632945 is an apocalyptic number.

1021632945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021632945 is a deficient number, since it is larger than the sum of its proper divisors (701058255).

1021632945 is a wasteful number, since it uses less digits than its factorization.

1021632945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1021632945 is about 31962.9933673303. The cubic root of 1021632945 is about 1007.1595994687.

The spelling of 1021632945 in words is "one billion, twenty-one million, six hundred thirty-two thousand, nine hundred forty-five".