1021199953 has 2 divisors, whose sum is σ = 1021199954. Its totient is φ = 1021199952.

The previous prime is 1021199951. The next prime is 1021199969. The reversal of 1021199953 is 3599911201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008189504 + 13010449 = 31752^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021199953 - 2¹ = 1021199951 is a prime.

Together with 1021199951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1021199951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510599976 + 510599977.

It is an arithmetic number, because the mean of its divisors is an integer number (510599977).

Almost surely, 2^1021199953 is an apocalyptic number.

It is an amenable number.

1021199953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021199953 is an equidigital number, since it uses as much as digits as its factorization.

1021199953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 1021199953 is about 31956.2193164335. The cubic root of 1021199953 is about 1007.0172934104.

The spelling of 1021199953 in words is "one billion, twenty-one million, one hundred ninety-nine thousand, nine hundred fifty-three".