19931961 has 32 divisors (see below), whose sum is σ = 32808960. Its totient is φ = 10511424.

The previous prime is 19931953. The next prime is 19931987. The reversal of 19931961 is 16913991.

It is a happy number.

It is not a de Polignac number, because 19931961 - 2³ = 19931953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19931921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13296 + ... + 14718.

It is an arithmetic number, because the mean of its divisors is an integer number (1025280).

Almost surely, 2^19931961 is an apocalyptic number.

It is an amenable number.

19931961 is a deficient number, since it is larger than the sum of its proper divisors (12876999).

19931961 is a wasteful number, since it uses less digits than its factorization.

19931961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485.

The product of its digits is 13122, while the sum is 39.

The square root of 19931961 is about 4464.5224828642. The cubic root of 19931961 is about 271.1336015127.

The spelling of 19931961 in words is "nineteen million, nine hundred thirty-one thousand, nine hundred sixty-one".