155343557 has 2 divisors, whose sum is σ = 155343558. Its totient is φ = 155343556.

The previous prime is 155343553. The next prime is 155343581. The reversal of 155343557 is 755343551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 66814276 = 9409^2 + 8174^2 .

It is a cyclic number.

It is not a de Polignac number, because 155343557 - 2² = 155343553 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155343557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155343553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77671778 + 77671779.

It is an arithmetic number, because the mean of its divisors is an integer number (77671779).

Almost surely, 2^155343557 is an apocalyptic number.

It is an amenable number.

155343557 is a deficient number, since it is larger than the sum of its proper divisors (1).

155343557 is an equidigital number, since it uses as much as digits as its factorization.

155343557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157500, while the sum is 38.

The square root of 155343557 is about 12463.6895420257. The cubic root of 155343557 is about 537.5651200712.

It can be divided in two parts, 15534 and 3557, that added together give a palindrome (19091).

The spelling of 155343557 in words is "one hundred fifty-five million, three hundred forty-three thousand, five hundred fifty-seven".