155091061 has 4 divisors (see below), whose sum is σ = 156959712. Its totient is φ = 153222412.

The previous prime is 155091029. The next prime is 155091071. The reversal of 155091061 is 160190551.

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, and also an emirpimes, since its reverse is a distinct semiprime: 160190551 = 9791 ⋅16361.

It is a cyclic number.

It is not a de Polignac number, because 155091061 - 2⁵ = 155091029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155091011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 934201 + ... + 934366.

It is an arithmetic number, because the mean of its divisors is an integer number (39239928).

Almost surely, 2^155091061 is an apocalyptic number.

It is an amenable number.

155091061 is a deficient number, since it is larger than the sum of its proper divisors (1868651).

155091061 is an equidigital number, since it uses as much as digits as its factorization.

155091061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868650.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 155091061 is about 12453.5561587845. The cubic root of 155091061 is about 537.2737086732.

The spelling of 155091061 in words is "one hundred fifty-five million, ninety-one thousand, sixty-one".