215137641 has 4 divisors (see below), whose sum is σ = 286850192. Its totient is φ = 143425092.

The previous prime is 215137639. The next prime is 215137693. The reversal of 215137641 is 146731512.

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 not a de Polignac number, because 215137641 - 2¹ = 215137639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215137599 and 215137608.

It is not an unprimeable number, because it can be changed into a prime (215137621) 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, 35856271 + ... + 35856276.

It is an arithmetic number, because the mean of its divisors is an integer number (71712548).

Almost surely, 2^215137641 is an apocalyptic number.

It is an amenable number.

215137641 is a deficient number, since it is larger than the sum of its proper divisors (71712551).

215137641 is an equidigital number, since it uses as much as digits as its factorization.

215137641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71712550.

The product of its digits is 5040, while the sum is 30.

The square root of 215137641 is about 14667.5710668127. The cubic root of 215137641 is about 599.2004544626.

The spelling of 215137641 in words is "two hundred fifteen million, one hundred thirty-seven thousand, six hundred forty-one".