15311421 has 6 divisors (see below), whose sum is σ = 22116510. Its totient is φ = 10207608.

The previous prime is 15311419. The next prime is 15311437. The reversal of 15311421 is 12411351.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 2134521 = 3630^2 + 1461^2 .

It is not a de Polignac number, because 15311421 - 2¹ = 15311419 is a prime.

It is a super-2 number, since 2×15311421² = 468879226078482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15311394 and 15311403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15311521) 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 5 ways as a sum of consecutive naturals, for example, 850626 + ... + 850643.

It is an arithmetic number, because the mean of its divisors is an integer number (3686085).

Almost surely, 2^15311421 is an apocalyptic number.

It is an amenable number.

15311421 is a deficient number, since it is larger than the sum of its proper divisors (6805089).

15311421 is a wasteful number, since it uses less digits than its factorization.

15311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701275 (or 1701272 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 15311421 is about 3912.9810886331. The cubic root of 15311421 is about 248.3162642603.

Adding to 15311421 its reverse (12411351), we get a palindrome (27722772).

The spelling of 15311421 in words is "fifteen million, three hundred eleven thousand, four hundred twenty-one".