155504197 has 2 divisors, whose sum is σ = 155504198. Its totient is φ = 155504196.

The previous prime is 155504171. The next prime is 155504201. The reversal of 155504197 is 791405551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155401156 + 103041 = 12466^2 + 321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155504197 is a prime.

It is a super-2 number, since 2×155504197² = 48363110569229618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155504137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77752098 + 77752099.

It is an arithmetic number, because the mean of its divisors is an integer number (77752099).

Almost surely, 2^155504197 is an apocalyptic number.

It is an amenable number.

155504197 is a deficient number, since it is larger than the sum of its proper divisors (1).

155504197 is an equidigital number, since it uses as much as digits as its factorization.

155504197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 37.

The square root of 155504197 is about 12470.1321965727. The cubic root of 155504197 is about 537.7503540421.

The spelling of 155504197 in words is "one hundred fifty-five million, five hundred four thousand, one hundred ninety-seven".