11961951 has 4 divisors (see below), whose sum is σ = 15949272. Its totient is φ = 7974632.

The previous prime is 11961899. The next prime is 11961967. The reversal of 11961951 is 15916911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11961951 - 2⁷ = 11961823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993656 + ... + 1993661.

It is an arithmetic number, because the mean of its divisors is an integer number (3987318).

Almost surely, 2^11961951 is an apocalyptic number.

11961951 is a deficient number, since it is larger than the sum of its proper divisors (3987321).

11961951 is an equidigital number, since it uses as much as digits as its factorization.

11961951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987320.

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

The square root of 11961951 is about 3458.6053547637. The cubic root of 11961951 is about 228.7006188011.

The spelling of 11961951 in words is "eleven million, nine hundred sixty-one thousand, nine hundred fifty-one".