155979853 has 2 divisors, whose sum is σ = 155979854. Its totient is φ = 155979852.

The previous prime is 155979847. The next prime is 155979871. The reversal of 155979853 is 358979551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143568324 + 12411529 = 11982^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 155979853 - 2⁵ = 155979821 is a prime.

It is a super-3 number, since 3×155979853³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155979853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155979883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77989926 + 77989927.

It is an arithmetic number, because the mean of its divisors is an integer number (77989927).

Almost surely, 2^155979853 is an apocalyptic number.

It is an amenable number.

155979853 is a deficient number, since it is larger than the sum of its proper divisors (1).

155979853 is an equidigital number, since it uses as much as digits as its factorization.

155979853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 52.

The square root of 155979853 is about 12489.1894452763. The cubic root of 155979853 is about 538.2980859408.

The spelling of 155979853 in words is "one hundred fifty-five million, nine hundred seventy-nine thousand, eight hundred fifty-three".