157443697 has 4 divisors (see below), whose sum is σ = 162872820. Its totient is φ = 152014576.

The previous prime is 157443679. The next prime is 157443721. The reversal of 157443697 is 796344751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796344751 = 5347 ⋅148933.

It can be written as a sum of positive squares in 2 ways, for example, as 73977201 + 83466496 = 8601^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 157443697 - 2²³ = 149055089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157443607) 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, 2714518 + ... + 2714575.

It is an arithmetic number, because the mean of its divisors is an integer number (40718205).

Almost surely, 2^157443697 is an apocalyptic number.

It is an amenable number.

157443697 is a deficient number, since it is larger than the sum of its proper divisors (5429123).

157443697 is an equidigital number, since it uses as much as digits as its factorization.

157443697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429122.

The product of its digits is 635040, while the sum is 46.

The square root of 157443697 is about 12547.6570322909. The cubic root of 157443697 is about 539.9767902690.

The spelling of 157443697 in words is "one hundred fifty-seven million, four hundred forty-three thousand, six hundred ninety-seven".