157821263 has 4 divisors (see below), whose sum is σ = 159722808. Its totient is φ = 155919720.

The previous prime is 157821241. The next prime is 157821271. The reversal of 157821263 is 362128751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362128751 = 83 ⋅4362997.

It is a cyclic number.

It is not a de Polignac number, because 157821263 - 2⁸ = 157821007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821203) 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, 950648 + ... + 950813.

It is an arithmetic number, because the mean of its divisors is an integer number (39930702).

Almost surely, 2^157821263 is an apocalyptic number.

157821263 is a deficient number, since it is larger than the sum of its proper divisors (1901545).

157821263 is an equidigital number, since it uses as much as digits as its factorization.

157821263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901544.

The product of its digits is 20160, while the sum is 35.

The square root of 157821263 is about 12562.6933019954. The cubic root of 157821263 is about 540.4080854451.

The spelling of 157821263 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, two hundred sixty-three".