1261536122 has 32 divisors (see below), whose sum is σ = 2483412480. Its totient is φ = 465637680.

The previous prime is 1261536097. The next prime is 1261536149. The reversal of 1261536122 is 2216351621.

It is a super-2 number, since 2×1261536122² = 3182946774221597768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212648 + ... + 218499.

It is an arithmetic number, because the mean of its divisors is an integer number (77606640).

Almost surely, 2^1261536122 is an apocalyptic number.

1261536122 is a deficient number, since it is larger than the sum of its proper divisors (1221876358).

1261536122 is a wasteful number, since it uses less digits than its factorization.

1261536122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431186.

The product of its digits is 4320, while the sum is 29.

The square root of 1261536122 is about 35518.1097751555. The cubic root of 1261536122 is about 1080.5210454493.

Adding to 1261536122 its reverse (2216351621), we get a palindrome (3477887743).

The spelling of 1261536122 in words is "one billion, two hundred sixty-one million, five hundred thirty-six thousand, one hundred twenty-two".