131121451 has 18 divisors (see below), whose sum is σ = 143879820. Its totient is φ = 119160720.

The previous prime is 131121439. The next prime is 131121457. The reversal of 131121451 is 154121131.

It is not a de Polignac number, because 131121451 - 2⁹ = 131120939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131121457) 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 17 ways as a sum of consecutive naturals, for example, 1846746 + ... + 1846816.

Almost surely, 2^131121451 is an apocalyptic number.

131121451 is a deficient number, since it is larger than the sum of its proper divisors (12758369).

131121451 is an frugal number, since it uses more digits than its factorization.

131121451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 127 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 131121451 is about 11450.8275246813. The cubic root of 131121451 is about 508.0322108970.

Multiplying 131121451 by its sum of digits (19), we get a square (2491307569 = 49913²).

131121451 divided by its sum of digits (19) gives a square (6901129 = 2627²).

Adding to 131121451 its reverse (154121131), we get a palindrome (285242582).

The spelling of 131121451 in words is "one hundred thirty-one million, one hundred twenty-one thousand, four hundred fifty-one".