1320211957 has 2 divisors, whose sum is σ = 1320211958. Its totient is φ = 1320211956.

The previous prime is 1320211943. The next prime is 1320212053. The reversal of 1320211957 is 7591120231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1316673796 + 3538161 = 36286^2 + 1881^2 .

It is an emirp because it is prime and its reverse (7591120231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320211957 - 2²³ = 1311823349 is a prime.

It is a super-2 number, since 2×1320211957² = 3485919222811539698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320211157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660105978 + 660105979.

It is an arithmetic number, because the mean of its divisors is an integer number (660105979).

Almost surely, 2^1320211957 is an apocalyptic number.

It is an amenable number.

1320211957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320211957 is an equidigital number, since it uses as much as digits as its factorization.

1320211957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 1320211957 is about 36334.7210942922. The cubic root of 1320211957 is about 1097.0200216443.

The spelling of 1320211957 in words is "one billion, three hundred twenty million, two hundred eleven thousand, nine hundred fifty-seven".