157721041 has 2 divisors, whose sum is σ = 157721042. Its totient is φ = 157721040.

The previous prime is 157721027. The next prime is 157721077. The reversal of 157721041 is 140127751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153660816 + 4060225 = 12396^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 157721041 - 2⁵ = 157721009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157721141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78860520 + 78860521.

It is an arithmetic number, because the mean of its divisors is an integer number (78860521).

Almost surely, 2^157721041 is an apocalyptic number.

It is an amenable number.

157721041 is a deficient number, since it is larger than the sum of its proper divisors (1).

157721041 is an equidigital number, since it uses as much as digits as its factorization.

157721041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 157721041 is about 12558.7037945801. The cubic root of 157721041 is about 540.2936685687.

Adding to 157721041 its reverse (140127751), we get a palindrome (297848792).

The spelling of 157721041 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, forty-one".