15515441231 has 2 divisors, whose sum is σ = 15515441232. Its totient is φ = 15515441230.

The previous prime is 15515441209. The next prime is 15515441251. The reversal of 15515441231 is 13214451551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15515441231 - 2¹⁰ = 15515440207 is a prime.

It is a super-2 number, since 2×15515441231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15515441251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7757720615 + 7757720616.

It is an arithmetic number, because the mean of its divisors is an integer number (7757720616).

Almost surely, 2^15515441231 is an apocalyptic number.

15515441231 is a deficient number, since it is larger than the sum of its proper divisors (1).

15515441231 is an equidigital number, since it uses as much as digits as its factorization.

15515441231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 32.

Adding to 15515441231 its reverse (13214451551), we get a palindrome (28729892782).

The spelling of 15515441231 in words is "fifteen billion, five hundred fifteen million, four hundred forty-one thousand, two hundred thirty-one".