1520213537 has 2 divisors, whose sum is σ = 1520213538. Its totient is φ = 1520213536.

The previous prime is 1520213533. The next prime is 1520213549. The reversal of 1520213537 is 7353120251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279063696 + 241149841 = 35764^2 + 15529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520213537 - 2² = 1520213533 is a prime.

It is a super-2 number, since 2×1520213537² = 4622098396156100738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1520213531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760106768 + 760106769.

It is an arithmetic number, because the mean of its divisors is an integer number (760106769).

Almost surely, 2^1520213537 is an apocalyptic number.

It is an amenable number.

1520213537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520213537 is an equidigital number, since it uses as much as digits as its factorization.

1520213537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 1520213537 is about 38989.9158373034. The cubic root of 1520213537 is about 1149.8332554711.

Adding to 1520213537 its reverse (7353120251), we get a palindrome (8873333788).

The spelling of 1520213537 in words is "one billion, five hundred twenty million, two hundred thirteen thousand, five hundred thirty-seven".