157742971 has 2 divisors, whose sum is σ = 157742972. Its totient is φ = 157742970.

The previous prime is 157742969. The next prime is 157742987. The reversal of 157742971 is 179247751.

It is a weak prime.

It is an emirp because it is prime and its reverse (179247751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157742971 - 2¹ = 157742969 is a prime.

Together with 157742969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157740971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78871485 + 78871486.

It is an arithmetic number, because the mean of its divisors is an integer number (78871486).

Almost surely, 2^157742971 is an apocalyptic number.

157742971 is a deficient number, since it is larger than the sum of its proper divisors (1).

157742971 is an equidigital number, since it uses as much as digits as its factorization.

157742971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 43.

The square root of 157742971 is about 12559.5768638916. The cubic root of 157742971 is about 540.3187087514.

The spelling of 157742971 in words is "one hundred fifty-seven million, seven hundred forty-two thousand, nine hundred seventy-one".