155494397 has 2 divisors, whose sum is σ = 155494398. Its totient is φ = 155494396.

The previous prime is 155494373. The next prime is 155494403. The reversal of 155494397 is 793494551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85119076 + 70375321 = 9226^2 + 8389^2 .

It is an emirp because it is prime and its reverse (793494551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155494397 - 2⁶ = 155494333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155494327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77747198 + 77747199.

It is an arithmetic number, because the mean of its divisors is an integer number (77747199).

Almost surely, 2^155494397 is an apocalyptic number.

It is an amenable number.

155494397 is a deficient number, since it is larger than the sum of its proper divisors (1).

155494397 is an equidigital number, since it uses as much as digits as its factorization.

155494397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 47.

The square root of 155494397 is about 12469.7392514840. The cubic root of 155494397 is about 537.7390573177.

The spelling of 155494397 in words is "one hundred fifty-five million, four hundred ninety-four thousand, three hundred ninety-seven".