131215001 has 4 divisors (see below), whose sum is σ = 131427600. Its totient is φ = 131002404.

The previous prime is 131214991. The next prime is 131215009. The reversal of 131215001 is 100512131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100512131 = 2689 ⋅37379.

It is a cyclic number.

It is not a de Polignac number, because 131215001 - 2¹⁰ = 131213977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131215009) 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, 105371 + ... + 106608.

It is an arithmetic number, because the mean of its divisors is an integer number (32856900).

Almost surely, 2^131215001 is an apocalyptic number.

It is an amenable number.

131215001 is a deficient number, since it is larger than the sum of its proper divisors (212599).

131215001 is an equidigital number, since it uses as much as digits as its factorization.

131215001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212598.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 131215001 is about 11454.9116539588. The cubic root of 131215001 is about 508.1530025109.

Adding to 131215001 its reverse (100512131), we get a palindrome (231727132).

The spelling of 131215001 in words is "one hundred thirty-one million, two hundred fifteen thousand, one".