157271731 has 2 divisors, whose sum is σ = 157271732. Its totient is φ = 157271730.

The previous prime is 157271717. The next prime is 157271771. The reversal of 157271731 is 137172751.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (137172751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157271731 - 2¹¹ = 157269683 is a prime.

It is a super-2 number, since 2×157271731² = 49468794743472722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157271771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78635865 + 78635866.

It is an arithmetic number, because the mean of its divisors is an integer number (78635866).

Almost surely, 2^157271731 is an apocalyptic number.

157271731 is the 7932-nd centered pentagonal number.

157271731 is a deficient number, since it is larger than the sum of its proper divisors (1).

157271731 is an equidigital number, since it uses as much as digits as its factorization.

157271731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10290, while the sum is 34.

The square root of 157271731 is about 12540.8026457639. The cubic root of 157271731 is about 539.7801242469.

The spelling of 157271731 in words is "one hundred fifty-seven million, two hundred seventy-one thousand, seven hundred thirty-one".