91377421 has 4 divisors (see below), whose sum is σ = 91405600. Its totient is φ = 91349244.

The previous prime is 91377409. The next prime is 91377437. The reversal of 91377421 is 12477319.

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: 12477319 = 19 ⋅656701.

It is a cyclic number.

It is not a de Polignac number, because 91377421 - 2¹¹ = 91375373 is a prime.

It is a super-2 number, since 2×91377421² = 16699666137222482, 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 (91375421) 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, 8481 + ... + 15958.

It is an arithmetic number, because the mean of its divisors is an integer number (22851400).

Almost surely, 2^91377421 is an apocalyptic number.

It is an amenable number.

91377421 is a deficient number, since it is larger than the sum of its proper divisors (28179).

91377421 is a wasteful number, since it uses less digits than its factorization.

91377421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28178.

The product of its digits is 10584, while the sum is 34.

The square root of 91377421 is about 9559.1537805394. The cubic root of 91377421 is about 450.4151247488.

The spelling of 91377421 in words is "ninety-one million, three hundred seventy-seven thousand, four hundred twenty-one".