157730081 has 2 divisors, whose sum is σ = 157730082. Its totient is φ = 157730080.

The previous prime is 157730071. The next prime is 157730107. The reversal of 157730081 is 180037751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157728481 + 1600 = 12559^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 157730081 - 2⁶ = 157730017 is a prime.

It is a super-2 number, since 2×157730081² = 49757556904533122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157730011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78865040 + 78865041.

It is an arithmetic number, because the mean of its divisors is an integer number (78865041).

Almost surely, 2^157730081 is an apocalyptic number.

It is an amenable number.

157730081 is a deficient number, since it is larger than the sum of its proper divisors (1).

157730081 is an equidigital number, since it uses as much as digits as its factorization.

157730081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 157730081 is about 12559.0636991776. The cubic root of 157730081 is about 540.3039909316.

The spelling of 157730081 in words is "one hundred fifty-seven million, seven hundred thirty thousand, eighty-one".