155613131 has 4 divisors (see below), whose sum is σ = 157488072. Its totient is φ = 153738192.

The previous prime is 155613127. The next prime is 155613137. The reversal of 155613131 is 131316551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155613131 - 2² = 155613127 is a prime.

It is a super-2 number, since 2×155613131² = 48430893079246322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155613131.

It is not an unprimeable number, because it can be changed into a prime (155613137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937346 + ... + 937511.

It is an arithmetic number, because the mean of its divisors is an integer number (39372018).

Almost surely, 2^155613131 is an apocalyptic number.

155613131 is a deficient number, since it is larger than the sum of its proper divisors (1874941).

155613131 is an equidigital number, since it uses as much as digits as its factorization.

155613131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874940.

The product of its digits is 1350, while the sum is 26.

The square root of 155613131 is about 12474.4992284260. The cubic root of 155613131 is about 537.8758932555.

Adding to 155613131 its reverse (131316551), we get a palindrome (286929682).

The spelling of 155613131 in words is "one hundred fifty-five million, six hundred thirteen thousand, one hundred thirty-one".