1001213189261 has 2 divisors, whose sum is σ = 1001213189262. Its totient is φ = 1001213189260.

The previous prime is 1001213189239. The next prime is 1001213189281. The reversal of 1001213189261 is 1629813121001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661609799236 + 339603390025 = 813394^2 + 582755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001213189261 is a prime.

It is a super-2 number, since 2×1001213189261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001213189201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500606594630 + 500606594631.

It is an arithmetic number, because the mean of its divisors is an integer number (500606594631).

Almost surely, 2^{1001213189261} is an apocalyptic number.

It is an amenable number.

1001213189261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001213189261 is an equidigital number, since it uses as much as digits as its factorization.

1001213189261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 1001213189261 in words is "one trillion, one billion, two hundred thirteen million, one hundred eighty-nine thousand, two hundred sixty-one".