1321762501 has 2 divisors, whose sum is σ = 1321762502. Its totient is φ = 1321762500.

The previous prime is 1321762499. The next prime is 1321762511. The reversal of 1321762501 is 1052671231.

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., 1318053025 + 3709476 = 36305^2 + 1926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321762501 - 2¹ = 1321762499 is a prime.

It is a super-2 number, since 2×1321762501² = 3494112218099550002, which contains 22 as substring.

Together with 1321762499, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1321762501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321762511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660881250 + 660881251.

It is an arithmetic number, because the mean of its divisors is an integer number (660881251).

Almost surely, 2^1321762501 is an apocalyptic number.

It is an amenable number.

1321762501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321762501 is an equidigital number, since it uses as much as digits as its factorization.

1321762501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1321762501 is about 36356.0517795868. The cubic root of 1321762501 is about 1097.4493245109.

The spelling of 1321762501 in words is "one billion, three hundred twenty-one million, seven hundred sixty-two thousand, five hundred one".