15540131 has 2 divisors, whose sum is σ = 15540132. Its totient is φ = 15540130.

The previous prime is 15540103. The next prime is 15540139. The reversal of 15540131 is 13104551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15540131 - 2⁶ = 15540067 is a prime.

It is a super-2 number, since 2×15540131² = 482991342994322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15540139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770065 + 7770066.

It is an arithmetic number, because the mean of its divisors is an integer number (7770066).

Almost surely, 2^15540131 is an apocalyptic number.

15540131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15540131 is an equidigital number, since it uses as much as digits as its factorization.

15540131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 15540131 is about 3942.0972844414. The cubic root of 15540131 is about 249.5465433388.

Adding to 15540131 its reverse (13104551), we get a palindrome (28644682).

The spelling of 15540131 in words is "fifteen million, five hundred forty thousand, one hundred thirty-one".