1213534061 has 4 divisors (see below), whose sum is σ = 1233428124. Its totient is φ = 1193640000.

The previous prime is 1213534043. The next prime is 1213534121. The reversal of 1213534061 is 1604353121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 703045225 + 510488836 = 26515^2 + 22594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213534061 - 2²⁶ = 1146425197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213534061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213584061) 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, 9946940 + ... + 9947061.

It is an arithmetic number, because the mean of its divisors is an integer number (308357031).

Almost surely, 2^1213534061 is an apocalyptic number.

It is an amenable number.

1213534061 is a deficient number, since it is larger than the sum of its proper divisors (19894063).

1213534061 is an equidigital number, since it uses as much as digits as its factorization.

1213534061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19894062.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1213534061 is about 34835.8157791661. The cubic root of 1213534061 is about 1066.6386673097.

Adding to 1213534061 its reverse (1604353121), we get a palindrome (2817887182).

The spelling of 1213534061 in words is "one billion, two hundred thirteen million, five hundred thirty-four thousand, sixty-one".