121161409381 has 2 divisors, whose sum is σ = 121161409382. Its totient is φ = 121161409380.

The previous prime is 121161409373. The next prime is 121161409387. The reversal of 121161409381 is 183904161121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61425161281 + 59736248100 = 247841^2 + 244410^2 .

It is a cyclic number.

It is not a de Polignac number, because 121161409381 - 2³ = 121161409373 is a prime.

It is a super-2 number, since 2×121161409381² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121161409381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121161409387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60580704690 + 60580704691.

It is an arithmetic number, because the mean of its divisors is an integer number (60580704691).

Almost surely, 2^121161409381 is an apocalyptic number.

It is an amenable number.

121161409381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121161409381 is an equidigital number, since it uses as much as digits as its factorization.

121161409381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 121161409381 in words is "one hundred twenty-one billion, one hundred sixty-one million, four hundred nine thousand, three hundred eighty-one".