648514381 has 2 divisors, whose sum is σ = 648514382. Its totient is φ = 648514380.

The previous prime is 648514337. The next prime is 648514421. The reversal of 648514381 is 183415846.

It is an a-pointer prime, because the next prime (648514421) can be obtained adding 648514381 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588838756 + 59675625 = 24266^2 + 7725^2 .

It is a cyclic number.

It is not a de Polignac number, because 648514381 - 2¹⁹ = 647990093 is a prime.

It is a super-2 number, since 2×648514381² = 841141804727626322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648514331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324257190 + 324257191.

It is an arithmetic number, because the mean of its divisors is an integer number (324257191).

Almost surely, 2^648514381 is an apocalyptic number.

It is an amenable number.

648514381 is a deficient number, since it is larger than the sum of its proper divisors (1).

648514381 is an equidigital number, since it uses as much as digits as its factorization.

648514381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 648514381 is about 25465.9455155311. The cubic root of 648514381 is about 865.5786525442.

The spelling of 648514381 in words is "six hundred forty-eight million, five hundred fourteen thousand, three hundred eighty-one".