5951981 has 6 divisors (see below), whose sum is σ = 6923790. Its totient is φ = 5101656.

The previous prime is 5951951. The next prime is 5951983. The reversal of 5951981 is 1891595.

5951981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5597956 + 354025 = 2366^2 + 595^2 .

It is not a de Polignac number, because 5951981 - 2¹⁰ = 5950957 is a prime.

It is a super-2 number, since 2×5951981² = 70852155648722, 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 (5951983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60686 + ... + 60783.

It is an arithmetic number, because the mean of its divisors is an integer number (1153965).

Almost surely, 2^5951981 is an apocalyptic number.

It is an amenable number.

5951981 is a deficient number, since it is larger than the sum of its proper divisors (971809).

5951981 is a wasteful number, since it uses less digits than its factorization.

5951981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121483 (or 121476 counting only the distinct ones).

The product of its digits is 16200, while the sum is 38.

The square root of 5951981 is about 2439.6682151473. The cubic root of 5951981 is about 181.2260030061.

The spelling of 5951981 in words is "five million, nine hundred fifty-one thousand, nine hundred eighty-one".