149255861 has 4 divisors (see below), whose sum is σ = 150431232. Its totient is φ = 148080492.

The previous prime is 149255851. The next prime is 149255893. The reversal of 149255861 is 168552941.

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 a cyclic number.

It is not a de Polignac number, because 149255861 - 2⁶ = 149255797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149255831) 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, 587495 + ... + 587748.

It is an arithmetic number, because the mean of its divisors is an integer number (37607808).

Almost surely, 2^149255861 is an apocalyptic number.

It is an amenable number.

149255861 is a deficient number, since it is larger than the sum of its proper divisors (1175371).

149255861 is a wasteful number, since it uses less digits than its factorization.

149255861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175370.

The product of its digits is 86400, while the sum is 41.

The square root of 149255861 is about 12217.0315952771. The cubic root of 149255861 is about 530.4491990975.

The spelling of 149255861 in words is "one hundred forty-nine million, two hundred fifty-five thousand, eight hundred sixty-one".