4157121541 has 2 divisors, whose sum is σ = 4157121542. Its totient is φ = 4157121540.

The previous prime is 4157121523. The next prime is 4157121611. The reversal of 4157121541 is 1451217514.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2403940900 + 1753180641 = 49030^2 + 41871^2 .

It is a cyclic number.

It is not a de Polignac number, because 4157121541 - 2¹¹ = 4157119493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4157121341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078560770 + 2078560771.

It is an arithmetic number, because the mean of its divisors is an integer number (2078560771).

Almost surely, 2^4157121541 is an apocalyptic number.

It is an amenable number.

4157121541 is a deficient number, since it is larger than the sum of its proper divisors (1).

4157121541 is an equidigital number, since it uses as much as digits as its factorization.

4157121541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 31.

The square root of 4157121541 is about 64475.7438188967. The cubic root of 4157121541 is about 1607.9192725173.

The spelling of 4157121541 in words is "four billion, one hundred fifty-seven million, one hundred twenty-one thousand, five hundred forty-one".