124521691397 has 2 divisors, whose sum is σ = 124521691398. Its totient is φ = 124521691396.

The previous prime is 124521691387. The next prime is 124521691417. The reversal of 124521691397 is 793196125421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71652047041 + 52869644356 = 267679^2 + 229934^2 .

It is a cyclic number.

It is not a de Polignac number, because 124521691397 - 2⁴ = 124521691381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124521691337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62260845698 + 62260845699.

It is an arithmetic number, because the mean of its divisors is an integer number (62260845699).

Almost surely, 2^124521691397 is an apocalyptic number.

It is an amenable number.

124521691397 is a deficient number, since it is larger than the sum of its proper divisors (1).

124521691397 is an equidigital number, since it uses as much as digits as its factorization.

124521691397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The spelling of 124521691397 in words is "one hundred twenty-four billion, five hundred twenty-one million, six hundred ninety-one thousand, three hundred ninety-seven".