19151961 has 8 divisors (see below), whose sum is σ = 26158944. Its totient is φ = 12456480.

The previous prime is 19151947. The next prime is 19151963. The reversal of 19151961 is 16915191.

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

It is not a de Polignac number, because 19151961 - 2⁷ = 19151833 is a prime.

It is a super-2 number, since 2×19151961² = 733595220291042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19151963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77731 + ... + 77976.

It is an arithmetic number, because the mean of its divisors is an integer number (3269868).

Almost surely, 2^19151961 is an apocalyptic number.

It is an amenable number.

19151961 is a deficient number, since it is larger than the sum of its proper divisors (7006983).

19151961 is a wasteful number, since it uses less digits than its factorization.

19151961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155751.

The product of its digits is 2430, while the sum is 33.

The square root of 19151961 is about 4376.2953510932. The cubic root of 19151961 is about 267.5496678962.

The spelling of 19151961 in words is "nineteen million, one hundred fifty-one thousand, nine hundred sixty-one".