1321157 has 2 divisors, whose sum is σ = 1321158. Its totient is φ = 1321156.

The previous prime is 1321141. The next prime is 1321163. The reversal of 1321157 is 7511231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1256641 + 64516 = 1121^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321157 - 2⁴ = 1321141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321357) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660578 + 660579.

It is an arithmetic number, because the mean of its divisors is an integer number (660579).

2^1321157 is an apocalyptic number.

It is an amenable number.

1321157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321157 is an equidigital number, since it uses as much as digits as its factorization.

1321157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210, while the sum is 20.

The square root of 1321157 is about 1149.4159386401. The cubic root of 1321157 is about 109.7281717961.

Adding to 1321157 its reverse (7511231), we get a palindrome (8832388).

The spelling of 1321157 in words is "one million, three hundred twenty-one thousand, one hundred fifty-seven".