157821453 has 12 divisors (see below), whose sum is σ = 236407808. Its totient is φ = 105214140.

The previous prime is 157821431. The next prime is 157821463. The reversal of 157821453 is 354128751.

It is not a de Polignac number, because 157821453 - 2⁸ = 157821197 is a prime.

It is a super-2 number, since 2×157821453² = 49815222054062418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 324493 + ... + 324978.

Almost surely, 2^157821453 is an apocalyptic number.

It is an amenable number.

157821453 is a deficient number, since it is larger than the sum of its proper divisors (78586355).

157821453 is an frugal number, since it uses more digits than its factorization.

157821453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649486 (or 649474 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 157821453 is about 12562.7008640658. The cubic root of 157821453 is about 540.4083023096.

The spelling of 157821453 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, four hundred fifty-three".