91411381 has 4 divisors (see below), whose sum is σ = 93356352. Its totient is φ = 89466412.

The previous prime is 91411373. The next prime is 91411387. The reversal of 91411381 is 18311419.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18311419 = 7 ⋅2615917.

It is a cyclic number.

It is not a de Polignac number, because 91411381 - 2³ = 91411373 is a prime.

It is a super-2 number, since 2×91411381² = 16712081152654322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91411387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972415 + ... + 972508.

It is an arithmetic number, because the mean of its divisors is an integer number (23339088).

Almost surely, 2^91411381 is an apocalyptic number.

It is an amenable number.

91411381 is a deficient number, since it is larger than the sum of its proper divisors (1944971).

91411381 is a wasteful number, since it uses less digits than its factorization.

91411381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944970.

The product of its digits is 864, while the sum is 28.

The square root of 91411381 is about 9560.9299233913. The cubic root of 91411381 is about 450.4709160773.

The spelling of 91411381 in words is "ninety-one million, four hundred eleven thousand, three hundred eighty-one".