1950601991 has 16 divisors (see below), whose sum is σ = 2170845600. Its totient is φ = 1741219200.

The previous prime is 1950601967. The next prime is 1950601999. The reversal of 1950601991 is 1991060591.

It is a cyclic number.

It is not a de Polignac number, because 1950601991 - 2²⁶ = 1883493127 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 (1950601999) 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, 39185 + ... + 73733.

It is an arithmetic number, because the mean of its divisors is an integer number (135677850).

Almost surely, 2^1950601991 is an apocalyptic number.

1950601991 is a deficient number, since it is larger than the sum of its proper divisors (220243609).

1950601991 is a wasteful number, since it uses less digits than its factorization.

1950601991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34706.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 1950601991 is about 44165.6200114976. The cubic root of 1950601991 is about 1249.4615261500.

The spelling of 1950601991 in words is "one billion, nine hundred fifty million, six hundred one thousand, nine hundred ninety-one".