215401641 has 16 divisors (see below), whose sum is σ = 353480064. Its totient is φ = 113618304.

The previous prime is 215401639. The next prime is 215401661. The reversal of 215401641 is 146104512.

It is a happy number.

215401641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215401641 - 2¹ = 215401639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215401631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394236 + ... + 394781.

It is an arithmetic number, because the mean of its divisors is an integer number (22092504).

Almost surely, 2^215401641 is an apocalyptic number.

215401641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215401641 is a deficient number, since it is larger than the sum of its proper divisors (138078423).

215401641 is a wasteful number, since it uses less digits than its factorization.

215401641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789040.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 215401641 is about 14676.5677527138. The cubic root of 215401641 is about 599.4454515067.

It can be divided in two parts, 215 and 401641, that added together give a triangular number (401856 = T₈₉₆).

The spelling of 215401641 in words is "two hundred fifteen million, four hundred one thousand, six hundred forty-one".