157621237 has 2 divisors, whose sum is σ = 157621238. Its totient is φ = 157621236.

The previous prime is 157621201. The next prime is 157621253. The reversal of 157621237 is 732126751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157527601 + 93636 = 12551^2 + 306^2 .

It is an emirp because it is prime and its reverse (732126751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157621237 - 2⁷ = 157621109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157621537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78810618 + 78810619.

It is an arithmetic number, because the mean of its divisors is an integer number (78810619).

Almost surely, 2^157621237 is an apocalyptic number.

It is an amenable number.

157621237 is a deficient number, since it is larger than the sum of its proper divisors (1).

157621237 is an equidigital number, since it uses as much as digits as its factorization.

157621237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 157621237 is about 12554.7296665440. The cubic root of 157621237 is about 540.1796807182.

Adding to 157621237 its reverse (732126751), we get a palindrome (889747988).

The spelling of 157621237 in words is "one hundred fifty-seven million, six hundred twenty-one thousand, two hundred thirty-seven".