1969201391 has 4 divisors (see below), whose sum is σ = 1980584232. Its totient is φ = 1957818552.

The previous prime is 1969201387. The next prime is 1969201397. The reversal of 1969201391 is 1931029691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1969201391 - 2² = 1969201387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1969201397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5691161 + ... + 5691506.

It is an arithmetic number, because the mean of its divisors is an integer number (495146058).

Almost surely, 2^1969201391 is an apocalyptic number.

1969201391 is a deficient number, since it is larger than the sum of its proper divisors (11382841).

1969201391 is a wasteful number, since it uses less digits than its factorization.

1969201391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382840.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1969201391 is about 44375.6846820418. The cubic root of 1969201391 is about 1253.4202629852.

The spelling of 1969201391 in words is "one billion, nine hundred sixty-nine million, two hundred one thousand, three hundred ninety-one".