121399573 has 2 divisors, whose sum is σ = 121399574. Its totient is φ = 121399572.

The previous prime is 121399561. The next prime is 121399583. The reversal of 121399573 is 375993121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121396324 + 3249 = 11018^2 + 57^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121399573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121399583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60699786 + 60699787.

It is an arithmetic number, because the mean of its divisors is an integer number (60699787).

Almost surely, 2^121399573 is an apocalyptic number.

It is an amenable number.

121399573 is a deficient number, since it is larger than the sum of its proper divisors (1).

121399573 is an equidigital number, since it uses as much as digits as its factorization.

121399573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 40.

The square root of 121399573 is about 11018.1474395653. The cubic root of 121399573 is about 495.1525877239.

It can be divided in two parts, 12139 and 9573, that added together give a palindrome (21712).

The spelling of 121399573 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, five hundred seventy-three".