157809401 has 2 divisors, whose sum is σ = 157809402. Its totient is φ = 157809400.

The previous prime is 157809391. The next prime is 157809413. The reversal of 157809401 is 104908751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153165376 + 4644025 = 12376^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 157809401 - 2¹⁴ = 157793017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157809481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78904700 + 78904701.

It is an arithmetic number, because the mean of its divisors is an integer number (78904701).

Almost surely, 2^157809401 is an apocalyptic number.

It is an amenable number.

157809401 is a deficient number, since it is larger than the sum of its proper divisors (1).

157809401 is an equidigital number, since it uses as much as digits as its factorization.

157809401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 157809401 is about 12562.2211809855. The cubic root of 157809401 is about 540.3945459064.

The spelling of 157809401 in words is "one hundred fifty-seven million, eight hundred nine thousand, four hundred one".