1261341123 has 16 divisors (see below), whose sum is σ = 1945203456. Its totient is φ = 712081440.

The previous prime is 1261341119. The next prime is 1261341139. The reversal of 1261341123 is 3211431621.

It is a happy number.

It is not a de Polignac number, because 1261341123 - 2² = 1261341119 is a prime.

It is a super-2 number, since 2×1261341123² = 3181962857141802258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261341093 and 1261341102.

It is not an unprimeable number, because it can be changed into a prime (1261341023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360088 + ... + 363573.

It is an arithmetic number, because the mean of its divisors is an integer number (121575216).

Almost surely, 2^1261341123 is an apocalyptic number.

1261341123 is a deficient number, since it is larger than the sum of its proper divisors (683862333).

1261341123 is an equidigital number, since it uses as much as digits as its factorization.

1261341123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723754.

The product of its digits is 864, while the sum is 24.

The square root of 1261341123 is about 35515.3646046327. The cubic root of 1261341123 is about 1080.4653695748.

Adding to 1261341123 its reverse (3211431621), we get a palindrome (4472772744).

The spelling of 1261341123 in words is "one billion, two hundred sixty-one million, three hundred forty-one thousand, one hundred twenty-three".