20251513 has 2 divisors, whose sum is σ = 20251514. Its totient is φ = 20251512.

The previous prime is 20251507. The next prime is 20251519. The reversal of 20251513 is 31515202.

It is a balanced prime because it is at equal distance from previous prime (20251507) and next prime (20251519).

It can be written as a sum of positive squares in only one way, i.e., 13860729 + 6390784 = 3723^2 + 2528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20251513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20251519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125756 + 10125757.

It is an arithmetic number, because the mean of its divisors is an integer number (10125757).

Almost surely, 2^20251513 is an apocalyptic number.

It is an amenable number.

20251513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20251513 is an equidigital number, since it uses as much as digits as its factorization.

20251513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20251513 is about 4500.1681079711. The cubic root of 20251513 is about 272.5748771594.

Adding to 20251513 its reverse (31515202), we get a palindrome (51766715).

It can be divided in two parts, 202 and 51513, that added together give a palindrome (51715).

The spelling of 20251513 in words is "twenty million, two hundred fifty-one thousand, five hundred thirteen".