155554691 has 4 divisors (see below), whose sum is σ = 163741800. Its totient is φ = 147367584.

The previous prime is 155554687. The next prime is 155554733. The reversal of 155554691 is 196455551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196455551 = 3919 ⋅50129.

It is a cyclic number.

It is not a de Polignac number, because 155554691 - 2² = 155554687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155554601) 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, 4093526 + ... + 4093563.

It is an arithmetic number, because the mean of its divisors is an integer number (40935450).

Almost surely, 2^155554691 is an apocalyptic number.

155554691 is a deficient number, since it is larger than the sum of its proper divisors (8187109).

155554691 is an equidigital number, since it uses as much as digits as its factorization.

155554691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8187108.

The product of its digits is 135000, while the sum is 41.

The square root of 155554691 is about 12472.1566298696. The cubic root of 155554691 is about 537.8085523168.

The spelling of 155554691 in words is "one hundred fifty-five million, five hundred fifty-four thousand, six hundred ninety-one".