90471997439 has 16 divisors (see below), whose sum is σ = 92681508480. Its totient is φ = 88288704000.

The previous prime is 90471997411. The next prime is 90471997487. The reversal of 90471997439 is 93479917409.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90471997439 - 2¹² = 90471993343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90471997639) 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, 3972617 + ... + 3995325.

It is an arithmetic number, because the mean of its divisors is an integer number (5792594280).

Almost surely, 2^90471997439 is an apocalyptic number.

90471997439 is a deficient number, since it is larger than the sum of its proper divisors (2209511041).

90471997439 is a wasteful number, since it uses less digits than its factorization.

90471997439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23282.

The product of its (nonzero) digits is 15431472, while the sum is 62.

The spelling of 90471997439 in words is "ninety billion, four hundred seventy-one million, nine hundred ninety-seven thousand, four hundred thirty-nine".