1231955 has 4 divisors (see below), whose sum is σ = 1478352. Its totient is φ = 985560.

The previous prime is 1231943. The next prime is 1231961. The reversal of 1231955 is 5591321.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1231955 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123191 + ... + 123200.

It is an arithmetic number, because the mean of its divisors is an integer number (369588).

2^1231955 is an apocalyptic number.

1231955 is a deficient number, since it is larger than the sum of its proper divisors (246397).

1231955 is an equidigital number, since it uses as much as digits as its factorization.

1231955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246396.

The product of its digits is 1350, while the sum is 26.

The square root of 1231955 is about 1109.9346827629. The cubic root of 1231955 is about 107.2008629822.

The spelling of 1231955 in words is "one million, two hundred thirty-one thousand, nine hundred fifty-five".