1630653421 has 4 divisors (see below), whose sum is σ = 1630863100. Its totient is φ = 1630443744.

The previous prime is 1630653371. The next prime is 1630653443. The reversal of 1630653421 is 1243560361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271920100 + 1358733321 = 16490^2 + 36861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630653421 - 2²⁹ = 1093782509 is a prime.

It is a super-5 number, since 5×1630653421⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630653121) 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, 92706 + ... + 108883.

It is an arithmetic number, because the mean of its divisors is an integer number (407715775).

Almost surely, 2^1630653421 is an apocalyptic number.

It is an amenable number.

1630653421 is a deficient number, since it is larger than the sum of its proper divisors (209679).

1630653421 is an equidigital number, since it uses as much as digits as its factorization.

1630653421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209678.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1630653421 is about 40381.3499155241. The cubic root of 1630653421 is about 1177.0291591378.

The spelling of 1630653421 in words is "one billion, six hundred thirty million, six hundred fifty-three thousand, four hundred twenty-one".