155242137 has 4 divisors (see below), whose sum is σ = 206989520. Its totient is φ = 103494756.

The previous prime is 155242117. The next prime is 155242177. The reversal of 155242137 is 731242551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 155242137 - 2¹⁴ = 155225753 is a prime.

It is a super-2 number, since 2×155242137² = 48200242200653538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155242117) 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, 25873687 + ... + 25873692.

It is an arithmetic number, because the mean of its divisors is an integer number (51747380).

Almost surely, 2^155242137 is an apocalyptic number.

It is an amenable number.

155242137 is a deficient number, since it is larger than the sum of its proper divisors (51747383).

155242137 is an equidigital number, since it uses as much as digits as its factorization.

155242137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51747382.

The product of its digits is 8400, while the sum is 30.

The square root of 155242137 is about 12459.6202590609. The cubic root of 155242137 is about 537.4481069065.

Adding to 155242137 its reverse (731242551), we get a palindrome (886484688).

The spelling of 155242137 in words is "one hundred fifty-five million, two hundred forty-two thousand, one hundred thirty-seven".