91400487 has 8 divisors (see below), whose sum is σ = 121912704. Its totient is φ = 60910968.

The previous prime is 91400479. The next prime is 91400497. The reversal of 91400487 is 78400419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91400487 - 2³ = 91400479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91400417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9598 + ... + 16580.

It is an arithmetic number, because the mean of its divisors is an integer number (15239088).

Almost surely, 2^91400487 is an apocalyptic number.

91400487 is a deficient number, since it is larger than the sum of its proper divisors (30512217).

91400487 is a wasteful number, since it uses less digits than its factorization.

91400487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11349.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 91400487 is about 9560.3601919593. The cubic root of 91400487 is about 450.4530203292.

The spelling of 91400487 in words is "ninety-one million, four hundred thousand, four hundred eighty-seven".