1520350729 has 2 divisors, whose sum is σ = 1520350730. Its totient is φ = 1520350728.

The previous prime is 1520350717. The next prime is 1520350771. The reversal of 1520350729 is 9270530251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1516946704 + 3404025 = 38948^2 + 1845^2 .

It is an emirp because it is prime and its reverse (9270530251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1520350729 - 2¹⁵ = 1520317961 is a prime.

It is a super-2 number, since 2×1520350729² = 4622932678341662882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1520350694 and 1520350703.

It is not a weakly prime, because it can be changed into another prime (1520350129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760175364 + 760175365.

It is an arithmetic number, because the mean of its divisors is an integer number (760175365).

Almost surely, 2^1520350729 is an apocalyptic number.

It is an amenable number.

1520350729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520350729 is an equidigital number, since it uses as much as digits as its factorization.

1520350729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 1520350729 is about 38991.6751243134. The cubic root of 1520350729 is about 1149.8678434144.

The spelling of 1520350729 in words is "one billion, five hundred twenty million, three hundred fifty thousand, seven hundred twenty-nine".