157971602 has 4 divisors (see below), whose sum is σ = 236957406. Its totient is φ = 78985800.

The previous prime is 157971601. The next prime is 157971683. The reversal of 157971602 is 206179751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206179751 = 23 ⋅8964337.

It can be written as a sum of positive squares in only one way, i.e., 131767441 + 26204161 = 11479^2 + 5119^2 .

It is not an unprimeable number, because it can be changed into a prime (157971601) 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, 39492899 + ... + 39492902.

Almost surely, 2^157971602 is an apocalyptic number.

157971602 is a deficient number, since it is larger than the sum of its proper divisors (78985804).

157971602 is an equidigital number, since it uses as much as digits as its factorization.

157971602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78985803.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 157971602 is about 12568.6754274267. The cubic root of 157971602 is about 540.5796268156.

The spelling of 157971602 in words is "one hundred fifty-seven million, nine hundred seventy-one thousand, six hundred two".