1206312261 has 64 divisors (see below), whose sum is σ = 2123366400. Its totient is φ = 590155200.

The previous prime is 1206312253. The next prime is 1206312347. The reversal of 1206312261 is 1622136021.

It is not a de Polignac number, because 1206312261 - 2³ = 1206312253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206312161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 837580 + ... + 839018.

It is an arithmetic number, because the mean of its divisors is an integer number (33177600).

Almost surely, 2^1206312261 is an apocalyptic number.

1206312261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1206312261 is a deficient number, since it is larger than the sum of its proper divisors (917054139).

1206312261 is a wasteful number, since it uses less digits than its factorization.

1206312261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

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

The square root of 1206312261 is about 34732.0062910279. The cubic root of 1206312261 is about 1064.5185833593.

Adding to 1206312261 its reverse (1622136021), we get a palindrome (2828448282).

The spelling of 1206312261 in words is "one billion, two hundred six million, three hundred twelve thousand, two hundred sixty-one".