91420339947 has 32 divisors (see below), whose sum is σ = 129220116480. Its totient is φ = 57372949920.

The previous prime is 91420339939. The next prime is 91420339951. The reversal of 91420339947 is 74993302419.

It is not a de Polignac number, because 91420339947 - 2³ = 91420339939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91420339947.

It is not an unprimeable number, because it can be changed into a prime (91420339987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1668298 + ... + 1722224.

It is an arithmetic number, because the mean of its divisors is an integer number (4038128640).

Almost surely, 2^91420339947 is an apocalyptic number.

91420339947 is a deficient number, since it is larger than the sum of its proper divisors (37799776533).

91420339947 is a wasteful number, since it uses less digits than its factorization.

91420339947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54343.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 91420339947 in words is "ninety-one billion, four hundred twenty million, three hundred thirty-nine thousand, nine hundred forty-seven".