155235397 has 2 divisors, whose sum is σ = 155235398. Its totient is φ = 155235396.

The previous prime is 155235371. The next prime is 155235401. The reversal of 155235397 is 793532551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154405476 + 829921 = 12426^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 155235397 - 2¹⁵ = 155202629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155235797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77617698 + 77617699.

It is an arithmetic number, because the mean of its divisors is an integer number (77617699).

Almost surely, 2^155235397 is an apocalyptic number.

It is an amenable number.

155235397 is a deficient number, since it is larger than the sum of its proper divisors (1).

155235397 is an equidigital number, since it uses as much as digits as its factorization.

155235397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141750, while the sum is 40.

The square root of 155235397 is about 12459.3497823923. The cubic root of 155235397 is about 537.4403288364.

The spelling of 155235397 in words is "one hundred fifty-five million, two hundred thirty-five thousand, three hundred ninety-seven".