1951791449371 has 4 divisors (see below), whose sum is σ = 1953444110544. Its totient is φ = 1950138788200.

The previous prime is 1951791449353. The next prime is 1951791449411. The reversal of 1951791449371 is 1739441971591.

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 1951791449371 - 2⁷ = 1951791449243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1951791449171) 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, 826328815 + ... + 826331176.

It is an arithmetic number, because the mean of its divisors is an integer number (488361027636).

Almost surely, 2^{1951791449371} is an apocalyptic number.

1951791449371 is a deficient number, since it is larger than the sum of its proper divisors (1652661173).

1951791449371 is a wasteful number, since it uses less digits than its factorization.

1951791449371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652661172.

The product of its digits is 8573040, while the sum is 61.

The spelling of 1951791449371 in words is "one trillion, nine hundred fifty-one billion, seven hundred ninety-one million, four hundred forty-nine thousand, three hundred seventy-one".