155240511 has 4 divisors (see below), whose sum is σ = 206987352. Its totient is φ = 103493672.

The previous prime is 155240489. The next prime is 155240537. The reversal of 155240511 is 115042551.

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 155240511 - 2⁵ = 155240479 is a prime.

It is a super-2 number, since 2×155240511² = 48199232511082242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155240581) 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, 25873416 + ... + 25873421.

It is an arithmetic number, because the mean of its divisors is an integer number (51746838).

Almost surely, 2^155240511 is an apocalyptic number.

155240511 is a deficient number, since it is larger than the sum of its proper divisors (51746841).

155240511 is an equidigital number, since it uses as much as digits as its factorization.

155240511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51746840.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 155240511 is about 12459.5550081052. Note that the first 3 decimals coincide. The cubic root of 155240511 is about 537.4462304965.

The spelling of 155240511 in words is "one hundred fifty-five million, two hundred forty thousand, five hundred eleven".