190091421 has 16 divisors (see below), whose sum is σ = 303280320. Its totient is φ = 116979120.

The previous prime is 190091351. The next prime is 190091431. The reversal of 190091421 is 124190091.

It is not a de Polignac number, because 190091421 - 2¹⁴ = 190075037 is a prime.

It is a super-2 number, since 2×190091421² = 72269496675598482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190091431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270435 + ... + 271136.

It is an arithmetic number, because the mean of its divisors is an integer number (18955020).

Almost surely, 2^190091421 is an apocalyptic number.

It is an amenable number.

190091421 is a deficient number, since it is larger than the sum of its proper divisors (113188899).

190091421 is a wasteful number, since it uses less digits than its factorization.

190091421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541593 (or 541587 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 190091421 is about 13787.3645414923. The cubic root of 190091421 is about 574.9818983589.

The spelling of 190091421 in words is "one hundred ninety million, ninety-one thousand, four hundred twenty-one".