513091949 has 2 divisors, whose sum is σ = 513091950. Its totient is φ = 513091948.

The previous prime is 513091939. The next prime is 513091967. The reversal of 513091949 is 949190315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444450724 + 68641225 = 21082^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 513091949 - 2¹² = 513087853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513091939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256545974 + 256545975.

It is an arithmetic number, because the mean of its divisors is an integer number (256545975).

Almost surely, 2^513091949 is an apocalyptic number.

It is an amenable number.

513091949 is a deficient number, since it is larger than the sum of its proper divisors (1).

513091949 is an equidigital number, since it uses as much as digits as its factorization.

513091949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 513091949 is about 22651.5330386268. The cubic root of 513091949 is about 800.5683196079.

It can be divided in two parts, 5130 and 91949, that added together give a palindrome (97079).

The spelling of 513091949 in words is "five hundred thirteen million, ninety-one thousand, nine hundred forty-nine".