196990251 has 16 divisors (see below), whose sum is σ = 267112704. Its totient is φ = 129105504.

The previous prime is 196990249. The next prime is 196990259. The reversal of 196990251 is 152099691.

It is a happy number.

It is not a de Polignac number, because 196990251 - 2¹ = 196990249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196990259) 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, 197085 + ... + 198081.

It is an arithmetic number, because the mean of its divisors is an integer number (16694544).

Almost surely, 2^196990251 is an apocalyptic number.

196990251 is a deficient number, since it is larger than the sum of its proper divisors (70122453).

196990251 is an equidigital number, since it uses as much as digits as its factorization.

196990251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 196990251 is about 14035.3215495763. The cubic root of 196990251 is about 581.8551882837.

The spelling of 196990251 in words is "one hundred ninety-six million, nine hundred ninety thousand, two hundred fifty-one".