155261011 has 4 divisors (see below), whose sum is σ = 155630224. Its totient is φ = 154891800.

The previous prime is 155260981. The next prime is 155261023. The reversal of 155261011 is 110162551.

It is a happy number.

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 155261011 - 2²¹ = 153163859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155261081) 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, 183975 + ... + 184816.

It is an arithmetic number, because the mean of its divisors is an integer number (38907556).

Almost surely, 2^155261011 is an apocalyptic number.

155261011 is a deficient number, since it is larger than the sum of its proper divisors (369213).

155261011 is an equidigital number, since it uses as much as digits as its factorization.

155261011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369212.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 155261011 is about 12460.3776427522. The cubic root of 155261011 is about 537.4698866129.

The spelling of 155261011 in words is "one hundred fifty-five million, two hundred sixty-one thousand, eleven".