157427831 has 4 divisors (see below), whose sum is σ = 171739464. Its totient is φ = 143116200.

The previous prime is 157427819. The next prime is 157427833. The reversal of 157427831 is 138724751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157427831 is a prime.

It is a super-2 number, since 2×157427831² = 49567043946729122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157427833) 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 in 3 ways as a sum of consecutive naturals, for example, 7155800 + ... + 7155821.

It is an arithmetic number, because the mean of its divisors is an integer number (42934866).

Almost surely, 2^157427831 is an apocalyptic number.

157427831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

157427831 is a deficient number, since it is larger than the sum of its proper divisors (14311633).

157427831 is a wasteful number, since it uses less digits than its factorization.

157427831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14311632.

The product of its digits is 47040, while the sum is 38.

The square root of 157427831 is about 12547.0247867771. The cubic root of 157427831 is about 539.9586513836.

The spelling of 157427831 in words is "one hundred fifty-seven million, four hundred twenty-seven thousand, eight hundred thirty-one".