155973481 has 2 divisors, whose sum is σ = 155973482. Its totient is φ = 155973480.

The previous prime is 155973473. The next prime is 155973497. The reversal of 155973481 is 184379551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124434025 + 31539456 = 11155^2 + 5616^2 .

It is a cyclic number.

It is not a de Polignac number, because 155973481 - 2³ = 155973473 is a prime.

It is a super-2 number, since 2×155973481² = 48655453550514722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155973781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77986740 + 77986741.

It is an arithmetic number, because the mean of its divisors is an integer number (77986741).

Almost surely, 2^155973481 is an apocalyptic number.

It is an amenable number.

155973481 is a deficient number, since it is larger than the sum of its proper divisors (1).

155973481 is an equidigital number, since it uses as much as digits as its factorization.

155973481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 155973481 is about 12488.9343420486. The cubic root of 155973481 is about 538.2907557589.

The spelling of 155973481 in words is "one hundred fifty-five million, nine hundred seventy-three thousand, four hundred eighty-one".