194990251 has 8 divisors (see below), whose sum is σ = 208200960. Its totient is φ = 182173992.

The previous prime is 194990239. The next prime is 194990261. The reversal of 194990251 is 152099491.

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 194990251 - 2¹³ = 194982059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194990261) 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, 97591 + ... + 99568.

It is an arithmetic number, because the mean of its divisors is an integer number (26025120).

Almost surely, 2^194990251 is an apocalyptic number.

194990251 is a deficient number, since it is larger than the sum of its proper divisors (13210709).

194990251 is a wasteful number, since it uses less digits than its factorization.

194990251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197225.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 194990251 is about 13963.8909692106. The cubic root of 194990251 is about 579.8793357784.

The spelling of 194990251 in words is "one hundred ninety-four million, nine hundred ninety thousand, two hundred fifty-one".