951581 has 2 divisors, whose sum is σ = 951582. Its totient is φ = 951580.

The previous prime is 951571. The next prime is 951583. The reversal of 951581 is 185159.

951581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 502681 + 448900 = 709^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 951581 - 2¹⁰ = 950557 is a prime.

It is a super-2 number, since 2×951581² = 1811012799122, which contains 22 as substring.

Together with 951583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (951583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475790 + 475791.

It is an arithmetic number, because the mean of its divisors is an integer number (475791).

2⁹⁵¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

951581 is a deficient number, since it is larger than the sum of its proper divisors (1).

951581 is an equidigital number, since it uses as much as digits as its factorization.

951581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 29.

The square root of 951581 is about 975.4901332151. The cubic root of 951581 is about 98.3592602961.

It can be divided in two parts, 95158 and 1, that added together give a palindrome (95159).

The spelling of 951581 in words is "nine hundred fifty-one thousand, five hundred eighty-one".