1520323117 has 2 divisors, whose sum is σ = 1520323118. Its totient is φ = 1520323116.

The previous prime is 1520323099. The next prime is 1520323177. The reversal of 1520323117 is 7113230251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817330921 + 702992196 = 28589^2 + 26514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520323117 - 2¹¹ = 1520321069 is a prime.

It is a super-2 number, since 2×1520323117² = 4622764760169191378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1520323091 and 1520323100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520323177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760161558 + 760161559.

It is an arithmetic number, because the mean of its divisors is an integer number (760161559).

Almost surely, 2^1520323117 is an apocalyptic number.

It is an amenable number.

1520323117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520323117 is an equidigital number, since it uses as much as digits as its factorization.

1520323117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1520323117 is about 38991.3210471253. The cubic root of 1520323117 is about 1149.8608822261.

Adding to 1520323117 its reverse (7113230251), we get a palindrome (8633553368).

The spelling of 1520323117 in words is "one billion, five hundred twenty million, three hundred twenty-three thousand, one hundred seventeen".