157275821 has 2 divisors, whose sum is σ = 157275822. Its totient is φ = 157275820.

The previous prime is 157275791. The next prime is 157275829. The reversal of 157275821 is 128572751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149181796 + 8094025 = 12214^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 157275821 - 2¹⁴ = 157259437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157275829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78637910 + 78637911.

It is an arithmetic number, because the mean of its divisors is an integer number (78637911).

Almost surely, 2^157275821 is an apocalyptic number.

It is an amenable number.

157275821 is a deficient number, since it is larger than the sum of its proper divisors (1).

157275821 is an equidigital number, since it uses as much as digits as its factorization.

157275821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 38.

The square root of 157275821 is about 12540.9657124162. The cubic root of 157275821 is about 539.7848033704.

The spelling of 157275821 in words is "one hundred fifty-seven million, two hundred seventy-five thousand, eight hundred twenty-one".