155801047 has 2 divisors, whose sum is σ = 155801048. Its totient is φ = 155801046.

The previous prime is 155801029. The next prime is 155801077. The reversal of 155801047 is 740108551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155801047 - 2¹⁵ = 155768279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155801017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77900523 + 77900524.

It is an arithmetic number, because the mean of its divisors is an integer number (77900524).

Almost surely, 2^155801047 is an apocalyptic number.

155801047 is a deficient number, since it is larger than the sum of its proper divisors (1).

155801047 is an equidigital number, since it uses as much as digits as its factorization.

155801047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 155801047 is about 12482.0289616713. The cubic root of 155801047 is about 538.0923163539.

Adding to 155801047 its reverse (740108551), we get a palindrome (895909598).

The spelling of 155801047 in words is "one hundred fifty-five million, eight hundred one thousand, forty-seven".