155733997 has 2 divisors, whose sum is σ = 155733998. Its totient is φ = 155733996.

The previous prime is 155733971. The next prime is 155734009. The reversal of 155733997 is 799337551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149108521 + 6625476 = 12211^2 + 2574^2 .

It is a cyclic number.

It is not a de Polignac number, because 155733997 - 2²⁷ = 21516269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155733997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155733797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77866998 + 77866999.

It is an arithmetic number, because the mean of its divisors is an integer number (77866999).

Almost surely, 2^155733997 is an apocalyptic number.

It is an amenable number.

155733997 is a deficient number, since it is larger than the sum of its proper divisors (1).

155733997 is an equidigital number, since it uses as much as digits as its factorization.

155733997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 893025, while the sum is 49.

The square root of 155733997 is about 12479.3428112221. The cubic root of 155733997 is about 538.0151147617.

The spelling of 155733997 in words is "one hundred fifty-five million, seven hundred thirty-three thousand, nine hundred ninety-seven".