1961791451 has 8 divisors (see below), whose sum is σ = 2009206320. Its totient is φ = 1914458112.

The previous prime is 1961791441. The next prime is 1961791453. The reversal of 1961791451 is 1541971691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1961791451 - 2¹⁸ = 1961529307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961791453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29795 + ... + 69363.

It is an arithmetic number, because the mean of its divisors is an integer number (251150790).

Almost surely, 2^1961791451 is an apocalyptic number.

1961791451 is a deficient number, since it is larger than the sum of its proper divisors (47414869).

1961791451 is a wasteful number, since it uses less digits than its factorization.

1961791451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40765.

The product of its digits is 68040, while the sum is 44.

The square root of 1961791451 is about 44292.1149980445. The cubic root of 1961791451 is about 1251.8461150252.

The spelling of 1961791451 in words is "one billion, nine hundred sixty-one million, seven hundred ninety-one thousand, four hundred fifty-one".