215426961731 has 2 divisors, whose sum is σ = 215426961732. Its totient is φ = 215426961730.

The previous prime is 215426961707. The next prime is 215426961773. The reversal of 215426961731 is 137169624512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215426961731 - 2⁶ = 215426961667 is a prime.

It is a super-2 number, since 2×215426961731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215426961131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107713480865 + 107713480866.

It is an arithmetic number, because the mean of its divisors is an integer number (107713480866).

Almost surely, 2^215426961731 is an apocalyptic number.

215426961731 is a deficient number, since it is larger than the sum of its proper divisors (1).

215426961731 is an equidigital number, since it uses as much as digits as its factorization.

215426961731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The spelling of 215426961731 in words is "two hundred fifteen billion, four hundred twenty-six million, nine hundred sixty-one thousand, seven hundred thirty-one".