1316172621 has 16 divisors (see below), whose sum is σ = 1807401600. Its totient is φ = 851329728.

The previous prime is 1316172607. The next prime is 1316172643. The reversal of 1316172621 is 1262716131.

It is not a de Polignac number, because 1316172621 - 2¹⁹ = 1315648333 is a prime.

It is a super-3 number, since 3×1316172621³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316172821) 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 15 ways as a sum of consecutive naturals, for example, 23335 + ... + 56363.

It is an arithmetic number, because the mean of its divisors is an integer number (112962600).

Almost surely, 2^1316172621 is an apocalyptic number.

It is an amenable number.

1316172621 is a deficient number, since it is larger than the sum of its proper divisors (491228979).

1316172621 is a wasteful number, since it uses less digits than its factorization.

1316172621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33428.

The product of its digits is 3024, while the sum is 30.

The square root of 1316172621 is about 36279.0934423671. The cubic root of 1316172621 is about 1095.9000602058.

Adding to 1316172621 its reverse (1262716131), we get a palindrome (2578888752).

The spelling of 1316172621 in words is "one billion, three hundred sixteen million, one hundred seventy-two thousand, six hundred twenty-one".