195121251 has 48 divisors (see below), whose sum is σ = 322897120. Its totient is φ = 115758720.

The previous prime is 195121217. The next prime is 195121253. The reversal of 195121251 is 152121591.

It is not a de Polignac number, because 195121251 - 2⁶ = 195121187 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (195121253) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 294861 + ... + 295521.

Almost surely, 2^195121251 is an apocalyptic number.

195121251 is a deficient number, since it is larger than the sum of its proper divisors (127775869).

195121251 is a wasteful number, since it uses less digits than its factorization.

195121251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 706 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 195121251 is about 13968.5808513249. The cubic root of 195121251 is about 580.0091665218.

The spelling of 195121251 in words is "one hundred ninety-five million, one hundred twenty-one thousand, two hundred fifty-one".