155148491 has 2 divisors, whose sum is σ = 155148492. Its totient is φ = 155148490.

The previous prime is 155148479. The next prime is 155148517. The reversal of 155148491 is 194841551.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (194841551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155148491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155148401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77574245 + 77574246.

It is an arithmetic number, because the mean of its divisors is an integer number (77574246).

Almost surely, 2^155148491 is an apocalyptic number.

155148491 is a deficient number, since it is larger than the sum of its proper divisors (1).

155148491 is an equidigital number, since it uses as much as digits as its factorization.

155148491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 38.

The square root of 155148491 is about 12455.8617124629. The cubic root of 155148491 is about 537.3400177200.

The spelling of 155148491 in words is "one hundred fifty-five million, one hundred forty-eight thousand, four hundred ninety-one".