131877421 has 4 divisors (see below), whose sum is σ = 142021852. Its totient is φ = 121732992.

The previous prime is 131877407. The next prime is 131877439. The reversal of 131877421 is 124778131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 88172100 + 43705321 = 9390^2 + 6611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131877421 is a prime.

It is a super-2 number, since 2×131877421² = 34783308339222482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131877401) 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, 5072196 + ... + 5072221.

It is an arithmetic number, because the mean of its divisors is an integer number (35505463).

Almost surely, 2^131877421 is an apocalyptic number.

It is an amenable number.

131877421 is a deficient number, since it is larger than the sum of its proper divisors (10144431).

131877421 is a wasteful number, since it uses less digits than its factorization.

131877421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144430.

The product of its digits is 9408, while the sum is 34.

The square root of 131877421 is about 11483.7894877954. The cubic root of 131877421 is about 509.0066799339.

The spelling of 131877421 in words is "one hundred thirty-one million, eight hundred seventy-seven thousand, four hundred twenty-one".