1213122461 has 8 divisors (see below), whose sum is σ = 1266063480. Its totient is φ = 1160922112.

The previous prime is 1213122409. The next prime is 1213122527. The reversal of 1213122461 is 1642213121.

It can be written as a sum of positive squares in 4 ways, for example, as 214183225 + 998939236 = 14635^2 + 31606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213122461 is a prime.

It is a super-2 number, since 2×1213122461² = 2943332210765393042, which contains 22 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 (1213122661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181820 + ... + 188373.

It is an arithmetic number, because the mean of its divisors is an integer number (158257935).

Almost surely, 2^1213122461 is an apocalyptic number.

It is an amenable number.

1213122461 is a deficient number, since it is larger than the sum of its proper divisors (52941019).

1213122461 is a wasteful number, since it uses less digits than its factorization.

1213122461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370335.

The product of its digits is 576, while the sum is 23.

The square root of 1213122461 is about 34829.9075651946. The cubic root of 1213122461 is about 1066.5180614049.

Adding to 1213122461 its reverse (1642213121), we get a palindrome (2855335582).

The spelling of 1213122461 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, four hundred sixty-one".