155402231 has 2 divisors, whose sum is σ = 155402232. Its totient is φ = 155402230.

The previous prime is 155402227. The next prime is 155402297. The reversal of 155402231 is 132204551.

It is a weak prime.

It is an emirp because it is prime and its reverse (132204551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155402231 - 2² = 155402227 is a prime.

It is a super-2 number, since 2×155402231² = 48299706799554722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 155402197 and 155402206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155402131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77701115 + 77701116.

It is an arithmetic number, because the mean of its divisors is an integer number (77701116).

Almost surely, 2^155402231 is an apocalyptic number.

155402231 is a deficient number, since it is larger than the sum of its proper divisors (1).

155402231 is an equidigital number, since it uses as much as digits as its factorization.

155402231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 155402231 is about 12466.0431172044. The cubic root of 155402231 is about 537.6327918524.

Adding to 155402231 its reverse (132204551), we get a palindrome (287606782).

It can be divided in two parts, 15540 and 2231, that added together give a palindrome (17771).

The spelling of 155402231 in words is "one hundred fifty-five million, four hundred two thousand, two hundred thirty-one".