1219957061 has 4 divisors (see below), whose sum is σ = 1220027532. Its totient is φ = 1219886592.

The previous prime is 1219957049. The next prime is 1219957133. The reversal of 1219957061 is 1607599121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 481802500 + 738154561 = 21950^2 + 27169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219957061 - 2²⁶ = 1152848197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219959061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10655 + ... + 50531.

It is an arithmetic number, because the mean of its divisors is an integer number (305006883).

Almost surely, 2^1219957061 is an apocalyptic number.

It is an amenable number.

1219957061 is a deficient number, since it is larger than the sum of its proper divisors (70471).

1219957061 is an equidigital number, since it uses as much as digits as its factorization.

1219957061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70470.

The product of its (nonzero) digits is 34020, while the sum is 41.

The square root of 1219957061 is about 34927.8837177405. The cubic root of 1219957061 is about 1068.5171940460.

The spelling of 1219957061 in words is "one billion, two hundred nineteen million, nine hundred fifty-seven thousand, sixty-one".