2951981 has 4 divisors (see below), whose sum is σ = 3080352. Its totient is φ = 2823612.

The previous prime is 2951957. The next prime is 2951983. The reversal of 2951981 is 1891592.

2951981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2951981 is a prime.

It is a super-2 number, since 2×2951981² = 17428383648722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2951983) 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 3 ways as a sum of consecutive naturals, for example, 64151 + ... + 64196.

It is an arithmetic number, because the mean of its divisors is an integer number (770088).

2^2951981 is an apocalyptic number.

It is an amenable number.

2951981 is a deficient number, since it is larger than the sum of its proper divisors (128371).

2951981 is a wasteful number, since it uses less digits than its factorization.

2951981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128370.

The product of its digits is 6480, while the sum is 35.

The square root of 2951981 is about 1718.1329983444. The cubic root of 2951981 is about 143.4513102345.

The spelling of 2951981 in words is "two million, nine hundred fifty-one thousand, nine hundred eighty-one".