155420431 has 4 divisors (see below), whose sum is σ = 157549552. Its totient is φ = 153291312.

The previous prime is 155420383. The next prime is 155420459. The reversal of 155420431 is 134024551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155420431 - 2¹³ = 155412239 is a prime.

It is a super-2 number, since 2×155420431² = 48311020744451522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155420396 and 155420405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155420471) 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, 1064451 + ... + 1064596.

It is an arithmetic number, because the mean of its divisors is an integer number (39387388).

Almost surely, 2^155420431 is an apocalyptic number.

155420431 is a deficient number, since it is larger than the sum of its proper divisors (2129121).

155420431 is an equidigital number, since it uses as much as digits as its factorization.

155420431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129120.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155420431 is about 12466.7730788685. The cubic root of 155420431 is about 537.6537793994.

Adding to 155420431 its reverse (134024551), we get a palindrome (289444982).

The spelling of 155420431 in words is "one hundred fifty-five million, four hundred twenty thousand, four hundred thirty-one".