157731146 has 4 divisors (see below), whose sum is σ = 236596722. Its totient is φ = 78865572.

The previous prime is 157731143. The next prime is 157731169. The reversal of 157731146 is 641137751.

157731146 = 3620² + 3621² + ... + 3631².

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

It can be written as a sum of positive squares in only one way, i.e., 126315121 + 31416025 = 11239^2 + 5605^2 .

It is a super-2 number, since 2×157731146² = 49758228836946632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157731143) 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, 39432785 + ... + 39432788.

Almost surely, 2^157731146 is an apocalyptic number.

157731146 is a deficient number, since it is larger than the sum of its proper divisors (78865576).

157731146 is an equidigital number, since it uses as much as digits as its factorization.

157731146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78865575.

The product of its digits is 17640, while the sum is 35.

The square root of 157731146 is about 12559.1060987636. The cubic root of 157731146 is about 540.3052069804.

Adding to 157731146 its reverse (641137751), we get a palindrome (798868897).

It can be divided in two parts, 1577 and 31146, that added together give a palindrome (32723).

The spelling of 157731146 in words is "one hundred fifty-seven million, seven hundred thirty-one thousand, one hundred forty-six".