1951221195 has 72 divisors (see below), whose sum is σ = 4248692448. Its totient is φ = 810881280.

The previous prime is 1951221163. The next prime is 1951221197. The reversal of 1951221195 is 5911221591.

It is not a de Polignac number, because 1951221195 - 2⁵ = 1951221163 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1951221197) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12519 + ... + 63711.

Almost surely, 2^1951221195 is an apocalyptic number.

1951221195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1951221195 is an abundant number, since it is smaller than the sum of its proper divisors (2297471253).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1951221195 is a wasteful number, since it uses less digits than its factorization.

1951221195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51233 (or 51219 counting only the distinct ones).

The product of its digits is 8100, while the sum is 36.

The square root of 1951221195 is about 44172.6294779924. The cubic root of 1951221195 is about 1249.5937228988.

The spelling of 1951221195 in words is "one billion, nine hundred fifty-one million, two hundred twenty-one thousand, one hundred ninety-five".