1212580861 has 4 divisors (see below), whose sum is σ = 1265301792. Its totient is φ = 1159859932.

The previous prime is 1212580849. The next prime is 1212580867. The reversal of 1212580861 is 1680852121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212580861 - 2²¹ = 1210483709 is a prime.

It is a super-3 number, since 3×1212580861³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212580867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26360431 + ... + 26360476.

It is an arithmetic number, because the mean of its divisors is an integer number (316325448).

Almost surely, 2^1212580861 is an apocalyptic number.

It is an amenable number.

1212580861 is a deficient number, since it is larger than the sum of its proper divisors (52720931).

1212580861 is an equidigital number, since it uses as much as digits as its factorization.

1212580861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52720930.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 1212580861 is about 34822.1317698960. The cubic root of 1212580861 is about 1066.3593216836.

The spelling of 1212580861 in words is "one billion, two hundred twelve million, five hundred eighty thousand, eight hundred sixty-one".