190961391 has 16 divisors (see below), whose sum is σ = 271724544. Its totient is φ = 118871424.

The previous prime is 190961389. The next prime is 190961429. The reversal of 190961391 is 193169091.

It is a happy number.

It is not a de Polignac number, because 190961391 - 2¹ = 190961389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190961321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8265 + ... + 21218.

It is an arithmetic number, because the mean of its divisors is an integer number (16982784).

Almost surely, 2^190961391 is an apocalyptic number.

190961391 is a deficient number, since it is larger than the sum of its proper divisors (80763153).

190961391 is a wasteful number, since it uses less digits than its factorization.

190961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29630.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 190961391 is about 13818.8780658923. The cubic root of 190961391 is about 575.8577152653.

The spelling of 190961391 in words is "one hundred ninety million, nine hundred sixty-one thousand, three hundred ninety-one".