1261157 has 2 divisors, whose sum is σ = 1261158. Its totient is φ = 1261156.

The previous prime is 1261133. The next prime is 1261171. The reversal of 1261157 is 7511621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948676 + 312481 = 974^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261157 - 2⁸ = 1260901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630578 + 630579.

It is an arithmetic number, because the mean of its divisors is an integer number (630579).

2^1261157 is an apocalyptic number.

It is an amenable number.

1261157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261157 is an equidigital number, since it uses as much as digits as its factorization.

1261157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 1261157 is about 1123.0124665381. The cubic root of 1261157 is about 108.0412793735.

Adding to 1261157 its reverse (7511621), we get a palindrome (8772778).

The spelling of 1261157 in words is "one million, two hundred sixty-one thousand, one hundred fifty-seven".