155630441 has 2 divisors, whose sum is σ = 155630442. Its totient is φ = 155630440.

The previous prime is 155630437. The next prime is 155630479. The reversal of 155630441 is 144036551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136305625 + 19324816 = 11675^2 + 4396^2 .

It is a cyclic number.

It is not a de Polignac number, because 155630441 - 2² = 155630437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (155630941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77815220 + 77815221.

It is an arithmetic number, because the mean of its divisors is an integer number (77815221).

Almost surely, 2^155630441 is an apocalyptic number.

It is an amenable number.

155630441 is a deficient number, since it is larger than the sum of its proper divisors (1).

155630441 is an equidigital number, since it uses as much as digits as its factorization.

155630441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 155630441 is about 12475.1930245588. The cubic root of 155630441 is about 537.8958364879.

Adding to 155630441 its reverse (144036551), we get a palindrome (299666992).

The spelling of 155630441 in words is "one hundred fifty-five million, six hundred thirty thousand, four hundred forty-one".