91399441 has 8 divisors (see below), whose sum is σ = 104685824. Its totient is φ = 78170400.

The previous prime is 91399433. The next prime is 91399459. The reversal of 91399441 is 14499319.

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

It is not a de Polignac number, because 91399441 - 2³ = 91399433 is a prime.

It is a super-2 number, since 2×91399441² = 16707715630224962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91399394 and 91399403.

It is not an unprimeable number, because it can be changed into a prime (91399241) 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, 10860 + ... + 17341.

It is an arithmetic number, because the mean of its divisors is an integer number (13085728).

Almost surely, 2^91399441 is an apocalyptic number.

It is an amenable number.

91399441 is a deficient number, since it is larger than the sum of its proper divisors (13286383).

91399441 is a wasteful number, since it uses less digits than its factorization.

91399441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28671.

The product of its digits is 34992, while the sum is 40.

The square root of 91399441 is about 9560.3054867509. The cubic root of 91399441 is about 450.4513019735.

The spelling of 91399441 in words is "ninety-one million, three hundred ninety-nine thousand, four hundred forty-one".