1320436157 has 2 divisors, whose sum is σ = 1320436158. Its totient is φ = 1320436156.

The previous prime is 1320436153. The next prime is 1320436171. The reversal of 1320436157 is 7516340231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 751088836 + 569347321 = 27406^2 + 23861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320436157 - 2² = 1320436153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320436151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660218078 + 660218079.

It is an arithmetic number, because the mean of its divisors is an integer number (660218079).

Almost surely, 2^1320436157 is an apocalyptic number.

It is an amenable number.

1320436157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320436157 is an equidigital number, since it uses as much as digits as its factorization.

1320436157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1320436157 is about 36337.8061665808. The cubic root of 1320436157 is about 1097.0821172207.

Adding to 1320436157 its reverse (7516340231), we get a palindrome (8836776388).

The spelling of 1320436157 in words is "one billion, three hundred twenty million, four hundred thirty-six thousand, one hundred fifty-seven".