91403641 has 8 divisors (see below), whose sum is σ = 106432704. Its totient is φ = 76867440.

The previous prime is 91403639. The next prime is 91403657. The reversal of 91403641 is 14630419.

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

It is a cyclic number.

It is not a de Polignac number, because 91403641 - 2¹ = 91403639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91403941) 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, 122815 + ... + 123556.

It is an arithmetic number, because the mean of its divisors is an integer number (13304088).

Almost surely, 2^91403641 is an apocalyptic number.

It is an amenable number.

91403641 is a deficient number, since it is larger than the sum of its proper divisors (15029063).

91403641 is a wasteful number, since it uses less digits than its factorization.

91403641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246431.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 91403641 is about 9560.5251424804. The cubic root of 91403641 is about 450.4582016017.

It can be divided in two parts, 9 and 1403641, that added together give a triangular number (1403650 = T₁₆₇₅).

The spelling of 91403641 in words is "ninety-one million, four hundred three thousand, six hundred forty-one".