156453421 has 4 divisors (see below), whose sum is σ = 156479644. Its totient is φ = 156427200.

The previous prime is 156453419. The next prime is 156453443. The reversal of 156453421 is 124354651.

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: 124354651 = 107 ⋅1162193.

It can be written as a sum of positive squares in 2 ways, for example, as 124077321 + 32376100 = 11139^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 156453421 - 2¹ = 156453419 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 (156453461) 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, 661 + ... + 17701.

It is an arithmetic number, because the mean of its divisors is an integer number (39119911).

Almost surely, 2^156453421 is an apocalyptic number.

It is an amenable number.

156453421 is a deficient number, since it is larger than the sum of its proper divisors (26223).

156453421 is an equidigital number, since it uses as much as digits as its factorization.

156453421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26222.

The product of its digits is 14400, while the sum is 31.

The square root of 156453421 is about 12508.1341933959. The cubic root of 156453421 is about 538.8423083524.

The spelling of 156453421 in words is "one hundred fifty-six million, four hundred fifty-three thousand, four hundred twenty-one".