19451961 has 16 divisors (see below), whose sum is σ = 30513600. Its totient is φ = 12204864.

The previous prime is 19451959. The next prime is 19451981. The reversal of 19451961 is 16915491.

It is not a de Polignac number, because 19451961 - 2¹ = 19451959 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 (19451981) 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, 20731 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (1907100).

Almost surely, 2^19451961 is an apocalyptic number.

It is an amenable number.

19451961 is a deficient number, since it is larger than the sum of its proper divisors (11061639).

19451961 is a wasteful number, since it uses less digits than its factorization.

19451961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42405 (or 42399 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 19451961 is about 4410.4377333775. The cubic root of 19451961 is about 268.9394196623.

The spelling of 19451961 in words is "nineteen million, four hundred fifty-one thousand, nine hundred sixty-one".