155533397 has 2 divisors, whose sum is σ = 155533398. Its totient is φ = 155533396.

The previous prime is 155533369. The next prime is 155533403. The reversal of 155533397 is 793335551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78251716 + 77281681 = 8846^2 + 8791^2 .

It is an emirp because it is prime and its reverse (793335551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155533397 - 2⁶ = 155533333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155533327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77766698 + 77766699.

It is an arithmetic number, because the mean of its divisors is an integer number (77766699).

Almost surely, 2^155533397 is an apocalyptic number.

It is an amenable number.

155533397 is a deficient number, since it is larger than the sum of its proper divisors (1).

155533397 is an equidigital number, since it uses as much as digits as its factorization.

155533397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 212625, while the sum is 41.

The square root of 155533397 is about 12471.3029391479. The cubic root of 155533397 is about 537.7840108563.

The spelling of 155533397 in words is "one hundred fifty-five million, five hundred thirty-three thousand, three hundred ninety-seven".