215401079 has 2 divisors, whose sum is σ = 215401080. Its totient is φ = 215401078.

The previous prime is 215400979. The next prime is 215401091. The reversal of 215401079 is 970104512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215401079 - 2¹² = 215396983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215401099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107700539 + 107700540.

It is an arithmetic number, because the mean of its divisors is an integer number (107700540).

Almost surely, 2^215401079 is an apocalyptic number.

215401079 is a deficient number, since it is larger than the sum of its proper divisors (1).

215401079 is an equidigital number, since it uses as much as digits as its factorization.

215401079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 215401079 is about 14676.5486065355. The cubic root of 215401079 is about 599.4449301727. Note that the first 3 decimals are identical.

The spelling of 215401079 in words is "two hundred fifteen million, four hundred one thousand, seventy-nine".