2115131501 has 12 divisors (see below), whose sum is σ = 2545304220. Its totient is φ = 1750452480.

The previous prime is 2115131489. The next prime is 2115131531. The reversal of 2115131501 is 1051315112.

2115131501 = 3720² + 3721² + ... + 3866².

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1812545476 + 302586025 = 42574^2 + 17395^2 .

It is not a de Polignac number, because 2115131501 - 2²² = 2110937197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115131531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 742820 + ... + 745661.

It is an arithmetic number, because the mean of its divisors is an integer number (212108685).

Almost surely, 2^2115131501 is an apocalyptic number.

It is an amenable number.

2115131501 is a deficient number, since it is larger than the sum of its proper divisors (430172719).

2115131501 is a wasteful number, since it uses less digits than its factorization.

2115131501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488524 (or 1488517 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 2115131501 is about 45990.5588246109. The cubic root of 2115131501 is about 1283.6475348209.

Adding to 2115131501 its reverse (1051315112), we get a palindrome (3166446613).

The spelling of 2115131501 in words is "two billion, one hundred fifteen million, one hundred thirty-one thousand, five hundred one".