155551117 has 2 divisors, whose sum is σ = 155551118. Its totient is φ = 155551116.

The previous prime is 155551091. The next prime is 155551129. The reversal of 155551117 is 711155551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109704676 + 45846441 = 10474^2 + 6771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155551117 is a prime.

It is a super-2 number, since 2×155551117² = 48392299999895378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155551177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77775558 + 77775559.

It is an arithmetic number, because the mean of its divisors is an integer number (77775559).

Almost surely, 2^155551117 is an apocalyptic number.

It is an amenable number.

155551117 is a deficient number, since it is larger than the sum of its proper divisors (1).

155551117 is an equidigital number, since it uses as much as digits as its factorization.

155551117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4375, while the sum is 31.

The square root of 155551117 is about 12472.0133498966. The cubic root of 155551117 is about 537.8044334171.

The spelling of 155551117 in words is "one hundred fifty-five million, five hundred fifty-one thousand, one hundred seventeen".