155430431 has 16 divisors (see below), whose sum is σ = 178698240. Its totient is φ = 133993440.

The previous prime is 155430413. The next prime is 155430437. The reversal of 155430431 is 134034551.

It is a cyclic number.

It is not a de Polignac number, because 155430431 - 2¹⁸ = 155168287 is a prime.

It is a super-2 number, since 2×155430431² = 48317237761691522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155430431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155430437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13106 + ... + 21968.

It is an arithmetic number, because the mean of its divisors is an integer number (11168640).

Almost surely, 2^155430431 is an apocalyptic number.

155430431 is a deficient number, since it is larger than the sum of its proper divisors (23267809).

155430431 is a wasteful number, since it uses less digits than its factorization.

155430431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 155430431 is about 12467.1741385127. The cubic root of 155430431 is about 537.6653103211.

Adding to 155430431 its reverse (134034551), we get a palindrome (289464982).

The spelling of 155430431 in words is "one hundred fifty-five million, four hundred thirty thousand, four hundred thirty-one".