71072217619531 has 2 divisors, whose sum is σ = 71072217619532. Its totient is φ = 71072217619530.

The previous prime is 71072217619523. The next prime is 71072217619547. The reversal of 71072217619531 is 13591671227017.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71072217619531 - 2³ = 71072217619523 is a prime.

It is a super-2 number, since 2×71072217619531² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71072217619231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35536108809765 + 35536108809766.

It is an arithmetic number, because the mean of its divisors is an integer number (35536108809766).

Almost surely, 2^{71072217619531} is an apocalyptic number.

71072217619531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71072217619531 is an equidigital number, since it uses as much as digits as its factorization.

71072217619531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The spelling of 71072217619531 in words is "seventy-one trillion, seventy-two billion, two hundred seventeen million, six hundred nineteen thousand, five hundred thirty-one".