1564216253 has 2 divisors, whose sum is σ = 1564216254. Its totient is φ = 1564216252.

The previous prime is 1564216219. The next prime is 1564216261. The reversal of 1564216253 is 3526124651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1534915684 + 29300569 = 39178^2 + 5413^2 .

It is a cyclic number.

It is not a de Polignac number, because 1564216253 - 2²⁶ = 1497107389 is a prime.

It is a super-2 number, since 2×1564216253² = 4893544972298720018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1564216273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782108126 + 782108127.

It is an arithmetic number, because the mean of its divisors is an integer number (782108127).

Almost surely, 2^1564216253 is an apocalyptic number.

It is an amenable number.

1564216253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564216253 is an equidigital number, since it uses as much as digits as its factorization.

1564216253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 1564216253 is about 39550.1738681387. The cubic root of 1564216253 is about 1160.8219137826.

The spelling of 1564216253 in words is "one billion, five hundred sixty-four million, two hundred sixteen thousand, two hundred fifty-three".