1261154 has 4 divisors (see below), whose sum is σ = 1891734. Its totient is φ = 630576.

The previous prime is 1261133. The next prime is 1261157. The reversal of 1261154 is 4511621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4511621 = 61 ⋅73961.

It can be written as a sum of positive squares in only one way, i.e., 1261129 + 25 = 1123^2 + 5^2 .

It is not an unprimeable number, because it can be changed into a prime (1261157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315287 + ... + 315290.

2^1261154 is an apocalyptic number.

1261154 is a deficient number, since it is larger than the sum of its proper divisors (630580).

1261154 is an equidigital number, since it uses as much as digits as its factorization.

1261154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630579.

The product of its digits is 240, while the sum is 20.

The square root of 1261154 is about 1123.0111308442. The cubic root of 1261154 is about 108.0411937051.

Adding to 1261154 its reverse (4511621), we get a palindrome (5772775).

The spelling of 1261154 in words is "one million, two hundred sixty-one thousand, one hundred fifty-four".