15220313881 has 2 divisors, whose sum is σ = 15220313882. Its totient is φ = 15220313880.

The previous prime is 15220313851. The next prime is 15220313897. The reversal of 15220313881 is 18831302251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14578147600 + 642166281 = 120740^2 + 25341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15220313881 is a prime.

It is a super-2 number, since 2×15220313881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15220313851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610156940 + 7610156941.

It is an arithmetic number, because the mean of its divisors is an integer number (7610156941).

Almost surely, 2^15220313881 is an apocalyptic number.

It is an amenable number.

15220313881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220313881 is an equidigital number, since it uses as much as digits as its factorization.

15220313881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 15220313881 in words is "fifteen billion, two hundred twenty million, three hundred thirteen thousand, eight hundred eighty-one".