131216401 has 4 divisors (see below), whose sum is σ = 131344704. Its totient is φ = 131088100.

The previous prime is 131216399. The next prime is 131216419. The reversal of 131216401 is 104612131.

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 131216401 - 2¹ = 131216399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131216431) 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, 62605 + ... + 64666.

It is an arithmetic number, because the mean of its divisors is an integer number (32836176).

Almost surely, 2^131216401 is an apocalyptic number.

It is an amenable number.

131216401 is a deficient number, since it is larger than the sum of its proper divisors (128303).

131216401 is a wasteful number, since it uses less digits than its factorization.

131216401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128302.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 131216401 is about 11454.9727629532. The cubic root of 131216401 is about 508.1548097526.

Adding to 131216401 its reverse (104612131), we get a palindrome (235828532).

The spelling of 131216401 in words is "one hundred thirty-one million, two hundred sixteen thousand, four hundred one".