1320450731 has 2 divisors, whose sum is σ = 1320450732. Its totient is φ = 1320450730.

The previous prime is 1320450701. The next prime is 1320450749. The reversal of 1320450731 is 1370540231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1370540231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320450731 - 2⁶ = 1320450667 is a prime.

It is a super-2 number, since 2×1320450731² = 3487180265996868722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320450731.

It is not a weakly prime, because it can be changed into another prime (1320450701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660225365 + 660225366.

It is an arithmetic number, because the mean of its divisors is an integer number (660225366).

Almost surely, 2^1320450731 is an apocalyptic number.

1320450731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320450731 is an equidigital number, since it uses as much as digits as its factorization.

1320450731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1320450731 is about 36338.0067009736. The cubic root of 1320450731 is about 1097.0861534669.

Adding to 1320450731 its reverse (1370540231), we get a palindrome (2690990962).

The spelling of 1320450731 in words is "one billion, three hundred twenty million, four hundred fifty thousand, seven hundred thirty-one".