15130321781 has 2 divisors, whose sum is σ = 15130321782. Its totient is φ = 15130321780.

The previous prime is 15130321777. The next prime is 15130321837. The reversal of 15130321781 is 18712303151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14391841156 + 738480625 = 119966^2 + 27175^2 .

It is a cyclic number.

It is not a de Polignac number, because 15130321781 - 2² = 15130321777 is a prime.

It is a super-2 number, since 2×15130321781² (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 (15130321751) 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, 7565160890 + 7565160891.

It is an arithmetic number, because the mean of its divisors is an integer number (7565160891).

Almost surely, 2^15130321781 is an apocalyptic number.

It is an amenable number.

15130321781 is a deficient number, since it is larger than the sum of its proper divisors (1).

15130321781 is an equidigital number, since it uses as much as digits as its factorization.

15130321781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 15130321781 in words is "fifteen billion, one hundred thirty million, three hundred twenty-one thousand, seven hundred eighty-one".