1016131621 has 4 divisors (see below), whose sum is σ = 1016419744. Its totient is φ = 1015843500.

The previous prime is 1016131591. The next prime is 1016131631. The reversal of 1016131621 is 1261316101.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1016131621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1016131592 and 1016131601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016131631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138705 + ... + 145846.

It is an arithmetic number, because the mean of its divisors is an integer number (254104936).

Almost surely, 2^1016131621 is an apocalyptic number.

It is an amenable number.

1016131621 is a deficient number, since it is larger than the sum of its proper divisors (288123).

1016131621 is an equidigital number, since it uses as much as digits as its factorization.

1016131621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288122.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1016131621 is about 31876.8194931678. The cubic root of 1016131621 is about 1005.3485490214.

Adding to 1016131621 its reverse (1261316101), we get a palindrome (2277447722).

The spelling of 1016131621 in words is "one billion, sixteen million, one hundred thirty-one thousand, six hundred twenty-one".